Hylotribus gauchus Queiroz & Mermudes

Queiroz, Fernando Luiz Cunha Avila Villar De & Mermudes, José Ricardo M., 2014, Six new species of Hylotribus Jekel, 1860 from Brazil (Coleoptera, Anthribidae, Anthribinae, Discotenini), Zootaxa 3814 (2), pp. 242-258 : 250

Hylotribus gauchus Queiroz & Mermudes sp. nov.

( Figs. 9–10 )

Male. Body integument black; antennae, tibiae and tarsi reddish-brown. Dorsal vestiture ( Figs. 9–10 ): dorsum of rostrum with short and sparse whitish pubescence; frons at each side on ocular margin with strip of dense and yellowish pubescence; antennae with dark-yellowish pubescence. Pronotum with short sparse light-brown pubescence; at each side of anterior and posterior third with weakly visible and irregular spot. Middle of pronotum, with narrow strip of yellowish and dark pubescence, extended from top of median tubercle to posterior margin of prothorax. Scutellar shield with elongate, suberect dense brownish setae, anteriorly oriented. Elytra with brownish pubescence, slightly lighter near humeri; ante-apical tubercles with narrow dark oblique strip between them, extended onto sutural interstria. Ventral vestiture and legs with sparse, yellowish pubescence; dense at mesepimeron and metepisternum. Femora with dark wide median strip. Tibiae with yellowish annular strip. Head and rostrum strongly punctate-corrugate. Rostrum with median dorsal carina, high in middle. Ventral region of rostrum strongly impressed, with coarse, dense punctures, lacking carinae.

Antennae short, reaching middle of prothorax; segment II 1 /3 longer than scape; III 1 /3 longer than II; IV–VIII 1 /3 shorter than III and subequal in length; club robust with enlarged segments; IX as wide at apex as long; X transverse; XI feebly longer than X.

Pronotum as wide as long, corrugate, partially obliterated by vestiture, median acuminate tubercle at apex well developed; each side with vestigial lateral tubercles, rounded on top. Antebasal carina 2-fragmented, slightly interrupted before lateral tubercles, sinuous at sides. Prosternum swollen, with coarse, dense punctures, microsculpture in interstices. Scutellar shield transversally oval. Elytra with anterior margin swollen around scutellar shield; humeral callus with tubercles on interstria 7; basal tubercles well developed; middle line with diminutive tubercle on interstria 5; tubercles of ante-apical declivity well developed; two median size tubercles after apical declivity, one at interstria 6 above the ante-apical tubercle (posterior view), and other at interstria 7, larger, about 2/3 the size of major tubercles. Mesosternal process with width subequal to half of middle coxa, round at apex. Metasternum with fine, sparse punctures.

Abdomen with corrugate ventrites; I–III subequal in length; IV narrow at middle, about half of III; V two times longer than IV, subplanar, with apex subtruncate.

Measurements, in mm, male: TL: 4.5; RL: 1.5; RAW: 0.8; RBW: 0.6; PL: 1.5; PW: 1.7; EL: 3.0; EW: 2.2.

Type material. HOLOTYPE male from BRAZIL: Rio Grande do Sul: Cambará do Sul, 06.I.1985, A. Lise leg., coll. MCN 61999 ( MCNZ).

Etymology. Named for the "gaucho" people linked with livestock activities in southern Brazil.

Remarks. Hylotyribus gauchus is unique in the genus as the only species with a transverse, suboblique, narrow and dark strip between the ante-apical tubercles, extended onto the elytral sutural interstria ( Fig. 9 ).

Figures

FIGURES 9 – 10. Hylotribus gauchus Queiroz & Mermudes sp. nov., holotype male: 9, dorsal; 10 lateral.