Xylosandrus bellinsulanus, Smith & Beaver & Cognato, 2020

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Xylosandrus bellinsulanus sp. nov. Fig. 92G, H, L

Type material.

Holotype, female, 海南岛 尖峰, 600 m 1984-III-26 采集者:宋士美 [China: Hainan, Jianfengling Mt., 600 m; 26.iii.1984, Shimei Song] (NMNH).

Diagnosis.

3.9 mm long (n = 1); 2.16 × as long as wide. This species is distinguished by its large size; lower part of eye larger than upper part; elytral disc ascending apically, longer than declivity; declivital face steep, abruptly separated from disc; elytra truncate; posterolateral margins of elytra carinate to suture forming a circumdeclivital ring; declivital face flat, strongly shagreened, dull, glabrous, no striae visible; sutural margin costate, costa increasing in height and size from base to apex, declivital striae and interstrial punctures replaced by confused granules, granules more abundant near apex (especially between interstriae 1 and 2); declivital posterolateral margin granulate; pronotum wider than long, from dorsal view rounded (type 1) and lateral view basic (type 0), summit at midpoint, basal 1/2 shiny, densely punctate; and broad, dense mycangial tuft on the pronotal base.

Similar species.

Amasa spp., Xylosandrus amputatus , X. mancus .

Description

(female). 3.9 mm long (n = 1); 2.16 × as long as wide. Head, antennae, pronotum, elytral disc and legs dark red-brown, declivital face maroon. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; median carina present; surface shagreened, impunctate, alutaceous, asperate; asperities longitudinal, larger, denser above epistoma, decreasing in density and height dorsally, becoming more weakly raised and sparse by upper level of eyes. Eyes shallowly emarginate just above antennal insertion, upper part smaller than lower part. Submentum narrow, triangular, slightly impressed. Antennal scape regularly thick, approximately as long as club. Pedicel as wide as scape, much shorter than funicle. Funicle 4-segmented, segment 1 as long as pedicel. Club longer than wide, obliquely truncate, type 1; segment 1 corneous, encircling anterior face; segment 2 narrow, concave, corneous on anterior face only; sutures absent on posterior face. Pronotum: 0.81 × as long as wide. In dorsal view rounded, type 1, sides parallel in basal 1/2, rounded anteriorly; anterior margin with a row of serrations. In lateral view basic, type 0, disc flat, summit at midpoint. Anterior slope with densely spaced, moderate asperities, becoming lower and more strongly transverse towards summit, bearing long, fine, erect hair-like setae. Some longer hair-like setae at anterior and lateral margins. Disc shiny, alutaceous with very dense, fine punctures, glabrous. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Mycangial tuft present along base, tuft narrow, dense, laterally extending to striae 3. Elytra: 1.38 × as long as wide, 1.7 × as long as pronotum. Scutellum moderately sized, linguiform, flush with elytra, flat, shiny. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 3/4, then sharply angulate to apex. Disc shiny, striae not impressed, punctures fine, shallow, strongly confused punctures separated by less than one diameter of a puncture, moderately setose, setae dense, erect, hair-like. Declivity truncate, strongly shagreened, glabrous; striae and interstriae strongly confused, indistinguishable, punctures replaced by granules; granules increasing in size and density apically and medially, especially between interstriae 1 and 2; sutural margin costae, costa increasing in height and size from base to apex. Posterolateral margin forming a circumdeclivital carina, carina granulate on apical 1/2. Legs: procoxae widely separated; prosternal coxal piece flat. Protibiae distinctly triangular, broadest at apical 1/4; posterior face smooth; apical 1/3 of outer margin with six large socketed denticles, their length much longer than basal width; apical mucro prominent, strongly incurved. Meso- and metatibiae flattened; outer margins evenly rounded with 13 and 14, small and variably sized socketed denticles, their length no longer than basal width, respectively.

Etymology.

L. bellus = beautiful; insulanus = islander. In reference to the species’ beautiful declivity and its island type locality. Noun in apposition.

Distribution.

China (Hainan).

Host plants.

Unknown.

Remarks.

Locality labels on the holotype are in Chinese and were translated by You Li. An English locality label has been placed on the specimen below the original locality labels.

Figures

Figure 92. Dorsal, lateral and declivital view of Xylosandrus adherescens, 2.0 mm (A, B, I), X. amputatus, 2.8 mm (C, D, J), X. beesoni, 2.2 - 2.7 mm (E, F, K), and X. bellinsulanus holotype, 3.9 mm (G, H, L).