Oligocorynus flavomaculatus ( Mader, 1943 ) Lopes & Gasca-Álvarez & Skelley, 2020

Lopes, Peterson Lásaro, Gasca-Álvarez, Héctor Jaime & Skelley, Paul E., 2020, Redescriptions, new synonymy, new combination and new records of Bacis Dejean, 1836 and Oligocorynus Dejean, 1876 (Coleoptera: Erotylidae: Erotylinae) for Colombia, Zootaxa 4809 (2), pp. 349-362 : 355-360

Oligocorynus flavomaculatus ( Mader, 1943) , new combination

( Figs. 30–56 )

Phricobacis flavomaculatus Mader 1943: 114 ; Mader 1951: 203, key; Alvarenga 1994: 119, catalog. Holotype: Peru, Chanchamayo (NHMW, not examined).

Redescription. Length 7 mm, thorax/abdomen R=1.4. Body moderately oval, sides subparallel, moderately convex. Head dark orange, antennae with antennomere I orange and antennomeres II to XI black, clypeus dark orange, pronotum orange, mesoventrite, mesanepisterna, mesepimera and metaventrite dark orange, coxae and femora dark orange, tibiae and tarsi black, elytra black with three orange maculae, epipleura black, ventrites dark orange ( Figs. 30–33 ).

Head (R=0.7): ocular striae absent, eyes finely faceted, interocular distance ~5/8 of head width, sub-ocular pore evident, post-mandibular lobes conspicuous with a setal tuft ( Fig. 34 ). Stridulatory organs at base of head absent in both sexes. Antennae (R=12.1): club with three flattened antennomeres, antennomere VIII and XI elongate, antennomeres more pubescent towards club ( Fig. 35 ). Clypeus (R=0.5): apex emarginate, lateral margins curved, central region elevated, surface with fine punctures ( Fig. 34 ). Labrum (R=0.5): sub-elliptical, with semicircular anterior elevation, distal margin truncate, anterior angles rounded, absence of membranous cover at proximal half ( Fig. 36 ). Epipharynx with setae in median region and at anterior margin, median region covered with microtrichiae, tormae with anterior projection reaching the basal quarter of labrum, posterior projection of tormae almost as long as the anterior projection ( Fig. 37 , arrow). Mandibles slightly asymmetrical, with three incisors, distal incisors narrower and sclerotized, membranous lobe covered with microtrichiae on molar region, one carina at dorsal region, ventral cavity with internal incisor margin curved, sinuate in left mandible, left mandible with proximal incisor smaller and attached to the middle incisor as a lobe ( Figs. 38–41 ). Maxillae (R=3.3): lacinia with two apical curved teeth, with long setae denser distally, basal palpomere elongate, palpomeres II–III as wide as long, palpomere IV very long, securiform, galea (R=1.3) lobed, slightly projected, with moderately long setae denser distally ( Figs. 42–43 ). Hypopharynx with two arms extending to anterior region of mentum ( Fig. 44 , arrow). Labium (R=1.6): ligula long (~3/4 width of mentum), fused at middle, basal sclerite absent, outer angles with moderate projection, setae denser on last palpomeres, basal palpomere with moderately curved base, palpomere III slightly securiform, asymmetrical, inner angle of distal margin slightly narrow, mentum with medial region without definite shape ( Fig. 45 ).

Thorax: pronotum (R=0.4) flattened, lateral region of posterior margin without depression, surface with strong punctures, prosternum with moderately long setae, basal margin of prosternum truncate, prosternal lines absent, procoxal lines absent. Scutellar shield (R=0.7) triangular. Metaventrite (R=0.4): mesocoxal lines absent, supracoxal lines conspicuous. Legs: surface of femora with sparse punctures, tibiae with dense setae and slightly expanded distally, metathoracic legs with femora as wide as the prothoracic legs. Elytra (R=2.2): subtriangular, base sinuate, surface with moderate punctures (φ~ 0.1 mm), striae and inter-striae indistinct. Metathoracic wings (R=2.3): with one axillar vein, veins AA 3+4 reaching CuA 3+4, veins MP 3+4 reaching MP 1+2, vein cua1-mp4 complete, vein r4 incomplete, medial spot conspicuous ( Fig. 46 ).

Abdomen: surface fine and sparse, with few short setae, ventrite 1 with anterior elevation. Male genital segments and genitalia: tergite VIII (R=0.4) subtriangular, base curved, setae denser distally ( Fig. 47 ), sternite VIII (R=0.3) transverse, distal margin emarginate, setae denser distally ( Fig. 48 ), tergite X (R=0.7) U-shaped, apex slightly rounded, setae denser distally ( Fig. 49 ), laterotergite IX (R=1.6) elongate, asymmetrical, lateral lobes sub trapezoidal; sternite IX setae denser distally ( Fig. 50 ). Aedeagus: tegmen elongate at proximal third, dorsal longitudinal line sclerotized, with dorsal subapical spot, tegmen arm long, with a sclerotized ventral line, lateral lobe width ~1/8 of tegmen length, setae denser distally, distal region of medial lobe with a short and cylindrical projection, internal sac short ( Fig. 51 ); head of flagellum falciform, elongate ( Fig. 52 , MAAEIS). Female genital segments and genitalia: tergite VIII (R=0.5) transverse, setae denser distally ( Fig. 53 ), sternite VIII (R=0.6) transverse, setae dens- er distally, median strut approximately four times longer than base ( Fig. 54 ), tergite IX and sternite IX indistinct, membranous, surface with microtrichiae uniformly distributed. Ovipositor: proctiger lobe long, covering the vulval lobe, subvulval lobe as wide as the basal segments of the gonocoxites, gonocoxites ~1/2 of ovipositor length with apex truncated and angulate at inner apex, gonostyli with dense setae ( Figs. 55–56 , arrow). Spermatheca oval.

Intraspecific variation. The sizes of the elytral maculae are variable. The elytral base can be straight.

Diagnosis. Oligocorynus flavomaculatus is distinguished from other Oligocorynus species by its dorsal coloration, having the elytral surface black with three orange spots and the pronotum orange, and clypeus emarginate.

Etymology. The genus name is derived from the Greek oligo, “few, scanty” and coryno, “club, mace”; the specific epithet is derived from the Latin flavus, “yellow” and maculatus, “with spots”, referring to the antennae and the elytral coloration.

Material examined. Colombia—Boyacá : Muzo (5°32’7’’N, 74°10’40’’W), ex-Coll. Alvarenga, M. Alvarenga det. [ Oligocorynus “sp.n.2”], homeotype, †483 ( MNRJ) . Brasil—Acre : Tarauacá (8°7’59’’S, 70°46’0’’W), ex-Coll. M. Viana, ex-Coll. J.E. Barriga Chile, P. Skelley det., ♂, #022163, #077131, †1 ( FSCA) . Rondônia : Ouro Preto do Oeste , sítio Deus é Amor (1°42’35’’S, 62°15’0’’W), M.F. Torres col. (26.iii.1985), P. Skelley det. 1995 [ Zonarius near rugipunctatus], ♂, †83 ( MPEG) ; Fazenda Rancho Grande , 62 km SO Ariquemes (10°18’0’’S, 62°37’48’’W), C.W. & L.B. O’Brien col. (16.x.1993), P. Skelley det., ♂, †2 ( FSCA) . Peru—P. Skelley det. 1994 [ Zonarius near rugipunctatus], ♀, †344 ( HNHM) .

Geographical distribution. Colombia (Boyacá) (new country record), Brazil (Acre, Rondônia), Peru (Chan- chamayo).

Remarks. According to the unpublished thesis of Lopes (2009), Phricobacis flavomaculatus and other species in the genus Phricobacis are more related to some species of the genus Oligocorynus . A phylogenetic analysis of the genus Oligocorynus should include a study of these species. For now, based on Lopes (2009), we transfer P. flavomaculatus to Oligocorynus , becoming Oligocorynus flavomaculatus (Mader) , new combination.

Figures

FIGURES 30–37. Oligocorynus flavomaculatus (Mader, 1943), specimen from Brazil. Habitus: (30–31) dorsal, (32) lateral, and (33) ventral view (scale bars for 30–33 = 3 mm); (34) head (scale bar = 1 mm); (35) left antenna (scale bar = 1 mm); (36) labrum (scale bar = 0.3 mm); (37) epipharynx (scale bar = 0.3 mm; arrow: torma).

FIGURES 38–45. Oligocorynus flavomaculatus (Mader, 1943). (38–39) Mandibles, dorsal view (arrow: proximal incisor); (40–41) mandibles, ventral view (arrow: proximal incisor); (42) maxilla, dorsal view; (43) maxilla, ventral view; (44) hypopharynx, dorsal view (arrow: hypopharynx arm); (45) labium, dorsal view. Scale bars = 0.3 mm.

FIGURES 46–52. Oligocorynus flavomaculatus (Mader, 1943). (46) Right metathoracic wing (scale bar = 3 mm); (47) eighth abdominal tergite; (48) eighth abdominal sternite; (49) tenth abdominal tergite; (50) ninth abdominal sternite; (51) aedeagus, lateral view; (52) head of flagellum. Scale bars = 0.3 mm.

FIGURES 53–56. Oligocorynus flavomaculatus (Mader, 1943). (53) Eighth abdominal tergite; (54) eighth abdominal sternite; (55) ovipositor, dorsal view (arrow: proctiger lobe); (56) ovipositor, ventral view. Scale bars = 0.3 mm.