Calonistes vittatus, 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 : 528-529

Calonistes vittatus sp. nov.

Fig. 31 (A–E)

Type material. Holotype: Female: CHINA: Yunnan, Daweishan National Natural Reserve , 22°50′51.17″N, 103°45′28.61″E, 29.VII.2020, 1884m, leg. LZ Meng ( IZAS) . Allotype: Male: as previous except: 22°50′52.14″N, 103°45′28.59″E, 19.VII.2020, 1881m ( IZAS) . Paratypes: as allotype (3♀♀); as previous except: 22°50′50.31″N, 103°45′28.60″E, 19.VII.2020, 1893m (2♀♀, 1♂); as previous except: 22°50′52.90″N, 103°45′28.95″E, 09.IV.2020, 1872m (1♂); as previous except: 19.VII.2020 (1♀); as previous except: 23°04′09.23″N, 103N°23′37.09″E, 18.IV.2019, 1379m (1♀) (all in HUC).

Description. Length 3.0– 3.7 mm, 2.8 × longer than wide (n = 5), body cylindrical, elongate and parallel sided; distinctly bicoloured, prothorax, anterior and posterior margins, a sutural stripe and elytral declivity dark brown, sides of elytra pale yellowish, three antennomeres of club dark-subviolaceous, other antennomeres yellowish brown; abdomen yellowish-brown, coxae and femora pale yellow, anterior tibiae dark.

Head. Labrum slightly concave at middle, surface glabrous, except for a brush of short, ventrally directed short setae on anterior margin; epistoma narrow, its surface dense granulate, apical margin arcuately emarginate, without hairs covered; fronto-clypeal suture sulciform, not distinct; frons rather narrow, wider than epistoma, its surface densely granular, convex at middle; vertex conspicuously longitudinally wrinkled; antennae with 10 antennomeres, basal two antennomeres elongate, the first slightly flattened, funicle antennomeres compressed and short, three antennomeres of club strongly developed and enlarged, apex of final segment extending to base of abdomen, thin and flattened, laminiform, apical margin of first two antennomeres of club distinctly emarginate, and each with two distinct, oblique separated areas of sensory pores on each side, the position of the areas differing between the two antennomeres ( Fig. 31C ); eyes small, distinctlyr separated from ocular margins posteriorly, without postocular setae.

Pronotum. Transverse, strongly narrowed in front and widest behind middle, 1.1 × wider than long (n = 5), anterior angle indistinct and obtuse, both sides of slope armed with three rows of short teeth, slightly hooked and back forwarded, surface coarse between teeth, matt, pronotal disc and sides glabrous, shining and smooth, with fine, sparse punctures, anterolateral areas with denser granules, without lateral carina, posterior angles broadly rounded, posterior margin weakly concave.

Elytra. 2.2 × longer than wide (n = 5), disc glabrous, anterior part of elytra distinctly punctured only basally and along suture; posterior part of disc very strongly, variously punctured, with granules becoming dentate and seriately arranged towards upper margin of declivity ( Fig. 31B ), much of dorsal and lateral surface smooth, semilucent; declivity abruptly truncate, upper margin of declivity with two pairs of sharply pointed, spiny tubercles, the upper pair smaller, the lower distinctly larger, both inwardly directed; face of declivity with shallow punctures, more or less similar size, evenly distributed, suture slightly raised and declivital margins carinate in lower half of declivity.

Abdomen. Penultimate ventrite of female with a posteriorly directed median tongue-like process extending over last ventrite, bearing dense long yellow pubescence, directed posteriorly; penultimate ventrite of male simple.

Legs. Anterior tibia normal and distinctly enlarged towards apex, flattened, without teeth on outer margin, covered with sparse golden yellow hairs.

Diagnosis. The genus Calonistes contains only one species, C. antennalis Lesne 1936 , first collected in West Malaysia. The species was later recorded in South Thailand ( Beaver et al. 2011). Calonistes vittatus sp. nov. has a relatively larger average body size (3.0– 3.7 mm vs 2.2–3.0 mm for C. antennalis ). The apices of the first two club antennomeres in C. vittatus are distinctly emarginate at the insertion of the following antennomere ( Fig. 31C ), but the emargination is not distinct in C. antennalis . The elytra are more elongate in C. vittatus (2.2 × longer than wide vs 1.7 × for C. antennalis ). The colour pattern of the elytra also differs between the species. In C. vittatus , there is a dorsal median dark band extending from the base of the elytra to the declivity, the sides of the elytra are pale yellowish with only a narrow dark band close to the margin, and not extending to the declivity. In C. antennalis , the dorsal dark band is not distinct except for a narrow dark area near the base, the basal half of the elytra is pale, the posterior half broadly darker, the sides of the elytra have a broad dark band with narrow pale areas at the margin.

Etymology. Calonistes vittatus is named in reference to the very long, flattened form of the antennal club. Latin ‘vittatus’ means like a ribbon or band.

Figures

FIGURE 31. (A, B, C, D, E) Lateral (A), dorsal (B), (C) antenna sensory depression, (D) posterior abdomen segment (♂) and (E) (♀) views of Calonistes vittatus sp. nov. Total horizontal scale bar of B =1 mm.