The new genus, Zygocellus gen. nov., with the single species Z. saphisus sp. nov from Bolivia, is described. Additionally, three new species in the genus Ochrimnus are described: Ochrimnus (Aglaochrimnus) nigrosteolaris sp. nov. from Venezuela, O. (Aglaochrimnus) rostratum sp. nov. from Brazil, and O. (Orthochrimnus) naevillus sp. nov. from Colombia. Also, the new species Zygochrimnus morronesus sp. nov. is described from Argentina. Photographs of the dorsal habitus of each species, and the parameres of some species are included. A discussion of their relationships with related species, in their respective genera, is provided.

The lygaeid subfamily Lygaeinae is represented in the Western Hemisphere by 24 genera, 7 subgenera and 216 species (A. Slater 1992, Henry et al. 2015, Dellapé and Henry 2020). Members of the subfamily are usually moderate sized to very large lygaeids. Most of the species are recognizable by their contrasting red and black or orange and black coloration; all abdominal spiracles dorsal; hemelytra impunctate; membrane of forewing usually with a distinct basal cell; hind wing with hamus and subcostal vein; and with sutures of the abdominal venter straight or nearly so, and all reaching lateral margins of abdomen (A. Slater & Baranowski 2001, Baranowski & A. Slater 2005, Cervantes-Peredo & Brailovsky 2014, Brailovsky 2018). The present paper adds one new genus and five new species from Argentina, Bolivia, Brazil, Colombia and Venezuela, and each species is described and photographed.

External structures were studied with a stereoscopic microscope (model Zeiss Stereo Discovery). Pictures were taken with a Nikon D200 camera. The following abbreviations are used for the institutions cited in this paper:

Type locality. Colombia, Cundinamarca.

Type material. Holotype ♂, COLOMBIA: Cundinamarca. Chipinque,Vereda Las Fruticas, 3570 m, 4˚344’N70°95’ W, 9-12.x.2014, C. Dumar (UNDC).

Description. Male (holotype). Dorsal coloration.Head black, with a pale yellowish spot at vertex; antennal segments I-III palecastaneous, IV yellow with apex pale castaneous; antenniferous tubercle palecastaneous; eyes and ocelli dark red; pronotum black, with a short triangularyellowish mark on middle third of posterior margin and reaching calli; scutellumblack with apex yellow; clavus black, with anterior angle pale yellowish brown;corium black with anterior third, apical margin and veins yellow; basal half ofcostal margin of corium yellow, apical half black; hemelytral membrane black,apical border slightly greyish;connexival segments black; dorsal abdominalsegments III-V pale orange, VI with anterior half pale orange and posterior halfblack, segment VII black.

Ventral coloration. Head and rostral segments I-IV black;buccula yellow; thorax black with acetabulae, ostiolar peritreme, anteriormargin of propleuron, posterior border of meso-, and metapleura, and uppermargin of metapleuron yellow; legs with coxae reddish brown; trochanters yellow;femora reddish brown with apical third dark yellow; tibiae and tarsi palecastaneous orange; abdominal sterna and genital capsule black.

Structure. Head moderately declivent; ocelli scarcely raised above surface;antennal segment I surpassing tylus about 1/3 its length; buccula moderatelyraised; rostrum reaching posterior border of mesocoxae; pronotum subquadrate,wider than long, with four transverse impressions behind each callus; scutellumwider than long; stem and arms equally broad; apex subacute; hemelytrasubmacropterous, reaching middle third of abdominal segment VI; claval andcorial veins slightly raised.

Vestiture. Dorsally and ventrally with short, fine, silvery, decumbentsetae.

Measurements. Male holotype. Body length 3.50 mm. Head length0.61 mm; width across eyes 0.92 mm; interocular distance 0.50 mm; interocellardistance 0.38 mm; preocular distance 0.40 mm; length antennal segments: I, 0.24mm, II, 0.54 mm, III, 0.48 mm, IV, 0.64 mm. Pronotum length 0.66 mm; widthacross humeral angles 1.04 mm. Scutellum length 0.36 mm, width 0.44 mm.

Female. Unknown.

Differential diagnosis.Ochrimnus (Orthochrimnus)naevillus sp. nov., like Ochrimnus(Orthochrimnus) testatusBrailovsky, 1982, are the only species inthe genus with subquadrate pronotum and submacropterus hemelytra. However, thenew species can be distinguished from the latter in having the body shorter than3.55 mm; head black, with a pale yellow spot on vertex; pronotum black, with ashort triangular yellowish mark on the middle third, just reaching the calli;and hemelytral membrane reaching middle third of abdominal segment VI. InO. (O.) testatus the bodyis longer than 4.60 mm; the head is dorsally dark ochre with tylus and vertexblack and with a yellowish discoidal spot on vertex; pronotal disk, brown with adark-ochre, narrow, longitudinal stripe extending along the pronotum, throughthe middle third of pronotum; and the hemelytral membrane not surpassingabdominal segment V.

Etymology. From the Latin, naevus (mark), and the diminutivesuffixillus, in reference to the small yellowish triangularspot on the posterior lobe of the pronotal disk.

Distribution. Colombia: Cundinamarca.

Type locality. Venezuela, Mérida.

Type material. Holotype ♂, VENEZUELA: Mérida, km 20 Mérida El Morro, 2400 m,20.xi.1992, col. C. Bordón (UNAM). PARATYPES: 4 ♂♂, 2 ♀♀,VENEZUELA: Mérida, Valle Grande, 11.v.1972, J. B. Terán &B. R. Cásares (IZAV). 3 ♂♂, 1 ♀, VENEZUELA: Mérida, El Valle, 2400m, 22.v.1983, C. Bordón (UNAM). 2 ♂♂, VENEZUELA: Mérida, Carbonera,2000 m, 22-27.vi.1968, J. y B. Bechyne (IZAV). 1 ♀, VENEZUELA:Mérida, La Mucuy, 19.vi.1975, M. Rojas (UNAM). 1 ♀, VENEZUELA:Mérida, La Azulita, 2000 m, 2.x.1969, J. y B. Bechyne (UNAM).

Description. Male (holotype). Dorsal coloration. Head black with pale yellow discoidal spot on vertex; antennal segments I-IV dark reddish brown to black; ocelli shiny red; eyes dark red; pronotum black; anterior and posterior margins yellow; anterolateral margins black or very narrowly and indistinctly yellow on the anterior third; scutellum black with apex yellow; clavus and corium black with claval commissure, and costal and apical margins yellow; costal margins of corium yellow, narrowing apically; hemelytral membrane black with narrow white margin; connexival segments black with upper border yellow; dorsal abdominal segments III-VI shiny orange, VII black.

Ventral coloration. Head and rostral segments I-IV black;buccula white; prosternum black with a broad white anterior margin; meso-, andmetasterna black; propleuron black with a broad white posterior margin; meso-,and metapleuron with narrow white to dark orange posterior margins; ostiolarperitreme black; pro-, meso-, and meta-acetabulae white; legs black to darkreddish brown; abdominal sterna III-VI shiny orange with black irregular anddiffuse longitudinal stripe along midline and at lateral margins; posteriorborder of sternites IV-VI black; pleural abdominal borders dark yellow; sterniteVII black with upper border yellow; genital capsule black.

Structure. Head moderately declivent; vertex convex; ocelli raised abovesurface; antennal segment I surpassing tylus by about 1/3 its length; bucculamoderately raised; rostrum reaching posterior border of metacoxae; pronotumwider than long, trapeziform; frontal and humeral angles rounded; anterolateralmargins straight; anterior lobe of pronotum with four transverse impressionsbehind calli; scutellum wider than long; stem and arms equally broad; apexsubacute; hemelytra macropterous, extending beyond apex of last abdominalsegment; claval and corial veins slightly raised. Parameres. As in Figures 7-8.

Measurements. Male holotype. Body length 4.93 mm. Head length0.64 mm; width across eyes 1.20 mm; interocular distance 0.68 mm; interocellardistance 0.40 mm; preocular distance 0.46 mm; length antennal segments: I, 0.32mm, II, 0.80 mm, III, 0.64 mm, IV, 0.92 mm. Pronotum length 0.92 mm; widthacross humeral angles 1.44 mm. Scutellum length 0.52 mm, width 0.64 mm.

Female. Habitus and color similar to male holotype. Connexival segments VIII-IX,dorsal abdominal segments VIII-IX and genital plates black.

Measurements. Female paratype. Body length 5.58 mm. Head length0.66 mm; width across eyes 1.24 mm; interocular distance 0.76 mm; interocellardistance 0.46 mm; preocular distance 0.56 mm; length antennal segments: I, 0.34mm, II, 0.80 mm, III, 0.64 mm, IV, 0.92 mm. Pronotum length 1.00 mm; widthacross humeral angles 1.64 mm. Scutellum length 0.53 mm, width 0.75 mm.

Variation. 1, anterolateral margins of pronotum black or with very narrow anddiffuse yellow mark at the anterior third. 2, connexival segments black withupper border yellow to castaneous orange. 3, posterior margin of metapleurondark castaneous to almost black. 4, abdominal sterna III-VI with or withoutblack longitudinal stripe across midline.

Differential diagnosis. Like O. (A.)disseptus (Stål,1874) and O.(A.) lynceusBrailovsky, 1982, with abdominal sterna III-VI shiny orange to red;pronotum with anterolateral margins black, and anterior and posterior marginsyellow to white; and costal margin of corium yellowish and clearly narrowingapically. Ochrimnus (Aglaochrimnus) nigrosteolaris sp. nov., issegregated by having the ostiolar peritreme black, and posterior margin ofmetapleuron dark orange to brown. On the other two species the ostiolarperitreme is yellow and the posterior margin of metapleuron is widely yellow.The parameres of each species (Figures7-12) are distinct.

Etymology. The species epithet, with the Latin adjective nigra(black), make reference to the diagnostic color of the ostiolar peritreme.

Distribution. Venezuela: Mérida.

Type locality. Brazil, Corumba.

Type material. Holotype: ♀, BRAZIL: Matto Grosso du Sul, Corumba,iv (without information) (CMNH). PARATYPE: 1 ♂, BRAZIL: MattoGrosso du Sul, Corumba, iv (without information) (UNAM).

Description. Female (holotype). Dorsal coloration.Head dark reddish brown with pale yellow discoidal spot at vertex; antennalsegments I-IV dark reddish brown; ocelli shiny red; eyes dark brown; pronotumblack with outer margin of humeral angles and posterior margin yellowish orange;pronotal disk with a short triangular yellowish-orange mark on middle third ofposterior margin, with apex extending just behind calli; callus transverselydark reddish brown; scutellum black with apex yellow; clavus and corium darkreddish brown with claval commissure, and costal and apical margins yellow;costal margin of corium yellow, narrowing apically; hemelytral membrane withnarrow white margin; connexival segments III-VI yellow, and VIIIX black; dorsalabdominal segments III-VI shiny orange and VII-IX black.

Ventral coloration. Head and rostral segments I-IV black;buccula black with outer border with a narrowing white band; prosternum blackwith anterior border with a narrowing yellow band; mesosternum black withposterior border with a narrowing yellow band; metasternum black; pro- andmesopleura black; metapleuron black, posterior border with a narrowing yellowband; inner border of pro-, meso-, and meta-acetabulae with narrowing yellowband; ostiolar peritreme yellow; legs dark reddish brown; abdominal sternite IIIshiny orange, laterally black; sterna IV-VI shiny orange with posterior borderand lateral margin black; sternite VII and genital plates black; pleural marginsof abdominal sterna III-VII yellow.

Structure. Head elongate, non declivent, wider than long; vertex slightlyconvex; ocelli raised above surface; antennal segment I reaching the apex andnot surpassing the tylus; buccula moderately raised; rostrum reaching posteriorborder of abdominal sternite IV; pronotum wider than long, trapeziform; frontaland humeral angles rounded; anterolateral margins straight; anterior borderconcave; posterolateral borders and posterior border straight; anterior lobe ofpronotal disk with four transverse impressions behind calli; scutellum widerthan long; apex subacute; macropterous, extending beyond the apex of lastabdominal segment; claval and corial veins slightly raised.

Measurements. Female holotype. Body length 7.57 mm. Head length1.09 mm; width across eyes 1.33 mm; interocular distance 0.80 mm; interocellardistance 0.56 mm; preocular distance 0.76 mm; length antennal segments: I, 0.44mm, II, 1.08 mm, III, 0.96 mm, IV, 1.28 mm. Pronotum length 1.24 mm; widthacross humeral angles 2.16 mm. Scutellum length 0.72 mm, width 0.84 mm.

Male. Habitus and color similar to female holotype. Head dorsally darkcastaneous with yellowish discoidal spot at vertex; tylus dark reddish brown;antennal segments I-III (IV broken) dark castaneous; head ventrally palecastaneous orange; fore legs with coxae and trochanters yellow, and femora,tibiae and tarsi dark reddish castaneous; middle and hind legs with coxae darkcastaneous, trochanters yellow, femora with basal half yellowish orange andapical half reddish brown, tibiae pale castaneous with basal and apical jointdarker and tarsi reddish brown; abdominal sterna III-VI shiny orange andlaterally black; sternite VII black; pleural margins III-VII yellow; genitalcapsule black. Parameres. As in Figures13-14.

Measurements. Male paratype. Body length 6.82 mm. Head length1.08 mm; width across eyes 1.24 mm; interocular distance 0.76 mm; interocellardistance 0.59 mm; preocular distance 0.78 mm; length antennal segments: I, 0.36mm, II, 1.08 mm, III, 0.92 mm, IV broken. Pronotum length 1.20 mm; width acrosshumeral angles 2.00 mm. Scutellum length 0.64 mm, width 0.87 mm.

Differential diagnosis. Like O. (A.)cellusBrailovsky,1982, O. (A.)disseptusStål 1874,O. (A.) lynceusBrailovsky, 1982, O.(A.) mirum Brailovsky, 1982, andO. (A.) schizusBrailovsky, 1982, with head black and a yellowish discoidal spot at vertex;scutellum black with apex yellow; clavus and corium black to dark brown withclaval commissure, and costal and apical margins of corium yellow; and abdominalsterna III-VI shiny red to shiny orange, laterally black and pleural marginsyellow. Ochrimnus (A.)rostratum sp. nov., is clearly separated by having the headconspicuously elongate, not declivent, with the vertex almost flat, and therostrum exceptionally elongate reaching the posterior border of abdominalsternite IV; antennal segment I reaching apex and not extending beyond the apexof tylus; and buccula black with only the upper border yellow. On the otherspecies the head is shorter, and not elongate, moderately declivent, with vertexconvex; rostrum reaching posterior border of metasternum; antennal segment Isurpassing the tylus by about 1/3 its length; and buccula entirely yellowishwhite. The parameres are distinct (Figures9-14).

Etymology. Named for the conspicuously elongate rostrum.

Distribution. Brazil: Corumba.

Type species.Zygocellus saphisus sp. nov., here designated.

Description. Body moderately elongate, widest across middle of abdomen, lengthless than 5.00 mm.

Head wider than long across eyes, sloping downward, vertex almost flat; ocellimuch closer to eyes than to each other; ocellus small, slightly raised abovesurface; eyes hemispheric, not protruding, with posterior margin nearly touchingfrontal angles of pronotum; buccula moderately produced, reaching middle thirdof eyes; rostrum extending to posterior border of abdominal sternite IV; rostralsegment I thickest, elongate, touching anterior margin of prosternum.

Thorax. Pronotum. Wider than long, trapeziform; anterior marginconcave; frontal angles obtuse, nearly touching posterior border of eyes;posterior margin straight, with shallow but distinct depression laterally;anterolateral margins obliquely straight; calli indistinct, defined primarily bypunctate areas immediately before and behind; callar impressions unbranched,obliquely sinuate, angled towards frontal pronotal angles; median carinaobsolete. Propleuron divided into three parts by dorso-ventral impressions;anterior and posterior parts coarsely punctate, median part smooth; meso-, andmetapleura with anterior half smooth, and posterior half punctate; posteriorborder of metapleuron almost straight; osteolar peritreme well developed.Legs. Unarmed; femora elongate.Scutellum. Wider than long, triangular;median carina T-shaped, with stem and arms clearly exposed and defined; lateralfovea deep. Hemelytra. Macropterous, surpassingapex of abdomen; costal margin emarginate; veins not raised.

Genital capsule. Subcircular in cross section.

Vestiture. Smooth except for punctures immediately before andbehind calli, and on pro-, meso-, and metapleuron. Head, pronotum, scutellum,clavus, corium, thorax, and legs almost glabrous; abdominal sterna clothed withshort, fine, decumbent, silvery setae.

Female. Unknown.

Differential diagnosis. This new genus is related toMelanopleurusStål(1874), Melanopleuroides A. Slater and Baranowski (1992), andZygochrimnusBrailovsky(2018). The general appearance is similar, with eyes not stalked;calli not depressed; pronotum without four transverse impressions behind calli;scutellum not swollen, with a T-shaped carina; pronotal disk almost entirelyblack to pale brown; and usually small bugs less than 5.00 mm.

Melanopleurus and Zygochrimnus are easily separated by having a distinct pale yellow to yellowish white discoidal spot on vertex, which is absent on the other two genera. In Melanopleuroides, known only from the Dominican Republic, the head dorsally, pronotum, scutellum, clavus and corium are densely clothed with short semidecumbent hairs; the vertex is convex; the posterior margin of metapleuron is distinctly concave; rostrum shorter, reaching posterior margin of metacoxae; outer margin of hemelytral membrane is black; and pronotal disk, scutellum, and clavus are entirely black. In Zygocellus gen. nov., here described from Brazil, the dorsal surfaces are almost glabrous; the vertex is nearly flat; the posterior margin of metapleuron straight; the rostrum conspicuously longer reaching posterior border of abdominal sternite IV; the outer margin of hemelytral membrane is dark yellow; and the pronotal disk, scutellum, and clavus bicolorous.

Etymology. Named after its similarity in appearance to thegenus Zygochrimnus.

Type locality. Bolivia, Chapare.

Type material. Holotype ♂, BOLIVIA: Chapare, xi (without additional information)(CMNH).

Description. Male (holotype). Dorsal coloration.Head dark reddish brown to black; tylus and jugum dark castaneous; ocelli palereddish; eyes dark reddish brown; antennal segments I-IV dark castaneous;pronotum brown, punctures black and anterior lobe across callus orange;scutellum dark brown with apex yellow; clavus with basal half, claval marginbordering scutellum, and claval commissure pale yellowish white; posterior halfblack; corium mostly black, with anterior angle, apical margin, and apical angleyellowish white; claval and corial veins concolorous with surrounding areas;hemelytral membrane brown with outer margin dark yellow; veins concolorous withsurrounding areas; connexival segments dark yellow.

Ventral coloration. Head pale brown; buccula yellowish white;antenniferous tubercles and rostral segments I-IV shiny brownish castaneous;pro-, meso-, and metasterna pale brown; propleuron pale brown with wide paleorange stripe at midline; meso-, and metapleuron pale brown; pro, meso-, andmeta-acetabulae yellowish white with upper margin pale orange; ostiolarperitreme orange; legs dark castaneous; abdominal sterna III-VI pale yellowexcept lateral margins of sterna III-IV near pleural margin pale brownishcastaneous; sternite VII and genital capsule dark to pale brownish castaneous;pleural abdominal sterna IIIVII yellow.

Female. Unknown.

Measurements. Male holotype. Body length 4.83 mm. Head length0.66 mm; width across eyes 1.04 mm; interocular distance 0.64 mm; interocellardistance 0.40 mm; preocular distance 0.48 mm; length antennal segments: I, 0.36mm, II, 0.85 mm, III, 0.67 mm, IV, 0.80 mm. Pronotum length 0.94 mm; widthacross humeral angles 1.48 mm. Scutellum length 0.50 mm, width 0.68 mm.

Etymology. From the Greek saphis (distinct),referring to the peculiarly delimited color pattern on the pronotum andclavus.

Type locality. Argentina, Neuquen.

Type material. Holotype ♂, ARGENTINA: Neuquen, Hwy 60, 9 km W, Hwy23 E, Mamuil Malal Colen, 890 m, 39˚45’19’’S-71˚7’29’’W, 26.xii.2005, col. F.Andrews (UCRC).

Description. Male (holotype). Dorsal coloration.Head dark reddish brown, except middle third of tylus, upper border of jugum anddiscoidal spot on vertex yellow; antennal segments I-IV dark castaneous orange;ocelli translucent; eyes dark reddish; pronotum reddish brown; upper border ofanterior lobe dark yellow; humeral angles white; scutellum reddish brown; apexdark yellow; clavus yellowish white with an irregular and elongate reddish-brownspot near middle third; corium reddish brown with apical third yellowish white;costal margin yellowish white, interrupted at middle third by a reddish-brownstripe; hemelytral membrane dark brown with basal angle and outer margin palewhite; connexival segments III-VI yellow, VII dark brown; dorsal abdominalsegments III-VI yellow, VII dark brown.

Ventral coloration. Head pale brown; buccula white with inner margin pale brown; rostral segments I-II and IV shiny castaneous, III shiny yellow; pro.-, meso- and metasternum pale brown; propleuron pale brown with anterior border white; meso., and metapleura pale brown with anterior margin white; pro.-, meso-, and meta-acetabulae and ostiolar peritreme white; coxae shiny dark castaneous; trochanters yellow; femora dark castaneous; tibiae and tarsi pale castaneous; abdominal sterna III-V dark brownish castaneous; VI-VII paler; pleural margin III dark brownish castaneous; IV-VII yellow, with scattered pink reflections; genital capsule dark brown.

Structure. Moderately robust, ovoid, widest point across middleof abdomen. Head wider than long; vertex almost flat; posterior margin of eyestouching frontal angles of pronotum; rostrum reaching posterior margin ofmetasternum. Thorax. Pronotum wider than long; frontal angles gently raised;anterolateral margins slightly sinuate; calli indistinct; callar impressionsunbranched. Scutellum wider than long; median carina T-shaped; lateral foveadeep. Legs unarmed.

Vestiture. Smooth, except for tiny punctures immediately beforeand behind calli. Head dorsally, pronotum, scutellum, clavus, corium, legs, andabdominal sterna densely clothed with long, stout, silvery, upright setae; headventrally and thorax clothed with short fine, decumbent silvery setae.

Female. Unknown.

Measurements. Male holotype. Body length 4.78 mm. Head length0.64 mm; width across eyes 1.20 mm; interocular distance 0.70 mm; interocellardistance 0.49 mm; preocular distance 0.46 mm; length antennal segments: I, 0.36mm, II, 0.68 mm, III, 0.52 mm, IV, 0.76 mm. Pronotum length 1.00 mm; widthacross humeral angles 1.60 mm. Scutellum length 0.56 mm, width 0.74 mm.

Differential diagnosis.Zygochrimnus morronesus sp. nov. (Figure 4) is the second species known in the genus, and likeZygochrimnus henryiBrailovsky, 2018 (Figure 2),the species presents body length shorter than 5 mm; head dorsally with yellowdiscoidal spot on vertex; posterior margin of eyes touching frontal angles ofpronotum; rostrum reaching posterior margin of metasternum; frontal anglesgently raised; calli indistinct; callar impression unbranched, obliquelysinuated, angled toward frontal angles; median carina obsolete; legs unarmed;and apical margin of corium yellowish white interrupted at middle third by areddish-brown stripe. In Zygochrimnus morronesus here describedfrom Argentina, the body is robust and ovoid; the vertex is almost flat;antennal segment I-IV are dark castaneous orange; the trochanters are yellow;and the anterior margin of meso-, and metapleura are white. InZygochrimnus henryi known from Ecuador and Perú the body iselongate and subovoid; the vertex is convex; antennal segments I-III are palereddish brown, IV dark orange; the trochanters are dark reddish orange; and theabdominal sterna III-VII are entirely black to dark reddish brown.

Etymology. With great pleasure, I dedicate this interesting speciesto my friend and colleague Dr. Juan Jose Morrone Lupi, in honor of his seminalcontribution on Entomology and biogeography.

Distribution. Argentina: Neuquen.