Xylodrypta guochuanii, 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 : 535-537

Xylodrypta guochuanii sp. nov.

Fig. 37 (A–E)

Type material. Holotype: Female: CHINA: Yunnan, Dehong Dai and Jingpo Autonomous Prefecture , 24°40′04.62″N, 097°35′47.74″E, 21.IV. 2018, 897m, leg. LZ Meng ( IZAS) . Allotype: Male: CHINA: Yunnan, Dai Autonomous Prefecture of Xishuangbanna , 21°36′36.00″N, 101°34′54.00″E, 03.II. 2018, 717m, leg. LZ Meng ( IZAS) . Paratypes: As holotype: (1♂) ; as holotype except: 24°39′55.14″N, 097°35′42.86″E, 18.VI. 2018, 863m (1♀); as allotype except: 21°36′50.00″N, 101°34′46.00″E, 03.IV. 2018, 811m (1♂); as previous except: 21°36′54.00″N, 101°34′44.00″E, 03.IV. 2018, 860m (1♂); as previous except: 21°36′55.00″N, 101°34′43.00″E, 16.III. 2018, 853m (1♀); as previous except: 21°37′0.00″N, 101°34′30.00″E, 18.III.2018, 1010m (1♂); as previous except: 21°57′44.24″N, 101°12′05.85″E, 21.II. 2018, 800m (1♂); as previous except: 21°57′47.34″N, 101°12′06.97″E, 21.IV. 2018, 800m (1♂); Yunnan, Gulinqing Provincial Natural Reserve , 22′43″ 51.53N, 103°59′35.34″E, 01.IV. 2018, 585m, leg. LZ Meng (1♂) ( All HUC) .

DESCRIPTIOn. Length 7.0–8.0 mm, 2.6 × longer than wide (n = 3), body cylindrical, elongated, and slightly widened posteriorly. Yellowish brown, head, anterior slope of pronotum and rim of elytral declivity black; anterior part of ventral surface dark, abdomen yellowish.

Head. Labrum slightly concave at middle and covered with dense, downward directed, short setae, forming a brush at the anterior margin. Epistoma narrow, surface densely granulate, apical margin arcuately emarginate, sparse soft golden yellow hair directed medially. Fronto-clypeal suture, sulciform, quite distinct. Frons narrow but wider than epistoma, surface densely grainy, convex at middle, with sparse setae clustered in a triangle. Vertex conspicuously wrinkled. Antennae with 10 antennomeres, funicle with 5, club with 3 antennomeres, the first two of club slightly transverse, the third elongate rectangular, slightly contracted near apex, both sides of first two antennomeres of club with distinct areas of sensory pores covered with short, dense, golden yellow hairs. Eyes slightly flattened, without setae behind ocular margins ( Fig. 39B, E ).

Pronotum. Transverse, 1.25 × wider than long (n = 3), strongly narrowed in front and widest behind middle, surface more or less roughly punctured and covered on, disc and sides glabrous, shining and smooth; lateral carina absent except for a fold near base of pronotum, anterior angles each with a relatively longer, upturned tooth, behind these a row of larger asperities forming the edge of the rasp; asperities on anterior slope large, densely placed, becoming smaller towards summit; area above anterior margin between uncinate teeth with dense, long, white, recumbent pubescence; posterior angles protruding and blunt apically; anterolateral part of pronotum punctured and with sparse, short, white, recumbent pubescence.

Scutellar shield. Small, tongue-shaped, dark black, surface finely punctured with sparse short hairs.

Elytra. Length to width ratio 1.8 × (n = 3). Glabrous, except at posterior margin, shining, punctures of discal surface fine at base, increasing in density and size posteriorly. Margin of elytral declivity with four pairs of rather bluntly tipped teeth, the more lateral ones curved slightly inwards, the bases broadly widened, the first pair smaller and adjacent to suture, the three outer pairs of similar size, the outermost inserted just below mid-height of declivity. Surface of declivity densely punctured, punctures circular, the base smooth, diameter a little smaller than interspaces. Suture raised in lower two-thirds of declivity, extending to apex.

Abdomen. Ventrites covered with dense, fine pubescence. Female. Fourth ventrite with a posteriorly directed median protrusion extended into two long, sharply pointed spines ( Fig. 37D ). Male. Last ventrite with pleural pieces.

Legs. Anterior tibia normal, widest apically, with a row of small teeth externally, covered with sparse golden yellow hairs.

Diagnosis. X. guochuanii is distinguished from the three other species of Xylodrypta by its distinct bi-coloured pattern. Most of the dorsal and lateral parts of the body are yellowish, but the head, the anterior slope of the pronotum and the elytral declivity are dark black. The species also differs from the other three species in the presence of a bispinose process on the fourth ventrite of the female. X. guochuanii is distinguished from X. bostrichoides by the absence of small, densely placed, anteriorly pointed sculpture on the pronotal disc. It resembles X. lanna Liu & Beaver ( Liu et al. 2021) , and differs from X. bostrychoides and X. zhenghei in having a small tubercle adjacent to the suture on the upper margin of the declivity, in addition to the three larger teeth more laterally. It differs from X. lanna in its colour pattern, weaker punctation of the elytra, and the modification of the fourth ventrite of the female.

Etymology. The species is named in memory of the famous, modern voyager, Guo Chuan (1965-2016), who passed away because of an accident in the Pacific near Hawaii.

Figures

FIGURE 37. (A, B, C, D, E) Lateral (A), dorsal (B), abdomen (C♀, D♂) and posterior 45° angel views of Xylodrypta guochuanii sp.nov.. Total horizontal scale bar of B =1 mm.

FIGURE 39. (A, B, C, D, E, F) Front and anterior 45° angel views on head of Calophagus colombiana sp.nov. (A, D), Xylodrypta guochuanii sp.nov. (B, E) and Xylodrypta zhenghei sp.nov. (C, F).