Coccidotrophus wheeleri (Schwarz and Barber) Halstead, 2020

Halstead, David G. H., 2020, New and little known Coleoptera (Silvanidae: Silvaninae) from Central and South America, Insecta Mundi 2020 (842), pp. 1-37 : 19-20

Coccidotrophus wheeleri (Schwarz and Barber) , new combination

( Fig. 58–63 , 67–69 )

Eunausibius wheeleri Schwarz and Barber 1921: 192 (paratypes examined).

Description. This redescription is based on two paratypes, one of each sex. Measurements, ratios etc., are given for the male specimen first. Length 3.32 mm (male), 3.30 mm (female), length to breadth ratios, 53 and 51:10, Schwarz and Barber (1921) give length as 3.5 – 3.0 mm, breadth 0.75 – 0.60 mm (i.e., presumably ratios of 47 – 50:10); general appearance sub-cylindrical, color yellowish brown, shining, appearing glabrous.

Head. Slightly longer than broad, margins in front of eyes sub-parallel before converging to front of head at midway; front of head weakly emarginate; obvious depressions present above insertion of antennae; eyes prominent, large with large facets, dorsal eye separation 6× breadth of eye in dorsal view; antennae robust, funicular segments transverse, club well developed with large segments; antennal grooves (beneath head) relatively long in comparison with head ( Fig. 63 ); puncturation, moderately dense, less so between depressions, punctures include some paired ones also some arranged in short curved lines.

Pronotum. Elongate, length to breadth ratio 14.5–15.0:10.0, sides almost straight from base of anterior angles to just before obtuse posterior angles, all margins with rim; disc with shallow longitudinal depressions on each side, deepest towards base; anterior angles weakly developed, very slightly produced forward, a very small depression encompassed by them ( Fig. 58 ); median longitudinal line impunctate, elsewhere puncturation moderately dense, in general similar to that of C. socialis with punctures elongate, tending to be arranged in short lines some of them curved.

Elytra. About 3 × as long as broad with narrow rim along suture and sides ( Fig. 61 ).

Legs. Male metafemora with small prominence on inner (proximal) margin and metatibiae with a small apical spine on proximal margin ( Fig. 62 ); female without these characters.

Abdomen. Femoral lines on first abdominal ventrite extending to about posterior quarter of ventrite; last abdominal ventrite convex medially, without a ridge along the edge.

Male genitalia. ( Fig. 67–69 ) Parameres rounded apically, 3 or 4 long setae at apex, group of very short setae along apical half of inner margins, many minute setae on surface as illustrated; median lobe with sides convergent to apex from basal half (it seems that apex has become bent over in preparation), irregular group of setae across middle; about 20 rods on each side of area towards ostium ( Fig. 67 ); internal sac with various modified setae, as illustrated ( Fig. 68 ); sternite 8 with a few short setae ( Fig. 69 ).

Material examined. One male and one female paratype, both with the same data labels: “Kartabo, Bartica Distr. Brit. Guiana W M Wheeler 1920 # 442 Aug 9 / wheeleri U. S. N. M. Paratype 24071 [red label]” ( USNM). Additional types are in the USNM.

Figures

Figures 52–63. Coccidotrophus spp., all paratypes except figure 54. 52–57) C. socialis Schwarz and Barber, male. 52) Habitus. 53) Anterior pronotal angle, semi-lateral view. 54) Pronotum (left half), variant with strongly incurved sides. 55) Antenna, enlarged. 56) Elytron, small part including sutural margin enlarged to show rows of punctures. 57) Head, part of left side to show antennal groove. 58–63) C. wheeleri (Schwarz and Barber), male. 58) Habitus. 59) Anterior pronotal angle, semi-lateral view. 60) Antenna, enlarged. 61) Elytron, small part including sutural margin to show rows of punctures. 62) Hind leg enlarged, showing small femoral prominence etc. 63) Head, part of left side to show antennal groove. Scale line = 1.0 mm.

Figures 64–69. Coccidotrophus spp., paratypes, male genitalia and associated sternites. 64–66) C. socialis Schwarz and Barber. 64) Genitalia without internal sac. 65) Internal sac. 66) Sternites 8–9. 67–69) C. wheeleri (Schwarz and Barber). 67) Genitalia without internal sac. 68) Internal sac. 69) Sternites 8–9. Scale lines = 0.2 mm.