Gracilenta yingjiangensis, Zhang & Meng & Beaver, 2022

Zhang, Yi-Feng, Meng, Ling-Zeng & Beaver, Roger A., 2022, A review of the non-lyctine powder-post beetles of Yunnan (China) with a new genus and new species (Coleoptera: Bostrichidae), Zootaxa 5091 (4), pp. 501-545 : 531-532

Gracilenta yingjiangensis sp. nov.

Fig. 32 (A–E)

Type material. Holotype: Male: CHINA: Yunnan, Dehong Dai and Jingpo Autonomous Prefecture , Yingjiang County, 24°40′04.62″N, 97°35′47.74″E, 20.05. 2018, 897m, leg. LZ Meng ( HUC).

Description. Length 10.0 mm. 2.7 × longer than wide; Dark reddish-brown, becoming black on anterior slope of pronotum and on elytral declivity, ventrally a little paler with darker areas, pro- and meso-tibiae black, antennae and tarsi light brown.

Head as described for genus. Frons with punctation denser than on clypeus, slightly rough. Antennae reddishbrown with antennomeres 3–7 gradually increasing in width relative to length.

Pronotum as described for genus, 1.25 × as wide as long, fairly strongly narrowed in anterior third, posterior border of rasp formed by small tubercles or granules, with dense, white, short, recumbent pubescence between and on teeth, area above anterior margin between uncinate teeth densely, finely and more or less roughly punctured; pronotal disc and postero-lateral areas of pronotum shining with fine, sparse punctures, anterolateral areas with denser granules and sparse, long, recumbent golden-yellowish setae directed anteriorly.

Scutellar shield. Small, tongue-shaped, slightly convex, surface finely punctured and covered with sparse soft hairs.

Elytra. As described for genus, 2.3 × as long as pronotum, 1.8 × as long as wide, widest at middle of declivity, shining, with sparse, fine and shallow punctures on disc, becoming deeper and larger towards lateral and posterior parts, upper half of declivity with strongest punctures, whole elytral surface with short, soft, golden-yellow, semirecumbent pubescence, more or less backwardly directed; posterior part of disc with two weak, widely-separated costae, ending at the upper margin of the declivity, a third costa, shorter but stronger and more strongly projecting, at the mid-height of the declivity, its apex blunt and medially curved; suture raised on the apical two-thirds of declivity, and slightly protruding at the apex, the declivital surface depressed on either side.

Abdomen. Reddish-brown, finely punctured, with dense, short, pale yellow, recumbent pubescence; metaventrite suture distinct; last ventrite of male with pleural pieces extending close to apex, but separated by a median foveole filled with dense, soft, golden yellow setae.

Legs. Ventro-posterior margins of both meso- and meta-femora with short, dense golden hairs; anterior face of anterior tibiae uniformly pubescent, external face of posterior tibiae with a row of long golden hairs, the outer margin with sparse and evenly spaced small teeth.

Distribution. China (Yunnan) only.

Etymology. Named in reference to the holotype locality. The single specimen described here was collected in Yingjiang County, in Dehong Prefecture of Western Yunnan, close to the Kachin State of Myanmar.

Figures

FIGURE 32. (A, B, C, D, E) Lateral (A), dorsal (B), (C) abdomen(♂), (D) head and (E) posterior 45° angel views of Gracilenta yingjiangensis gen. et sp. nov.. Total horizontal scale bar of B =1 mm.