Exomis pubescens, Wang & Zhou, 2020

Wang, Feng-Yan & Zhou, Hong-Zhang, 2020, Taxonomy of the leaf beetle genus Exomis Weise (Coleoptera: Chrysomelidae: Clytrini) with description of six new species from China, Zootaxa 4748 (2), pp. 351-364 : 355-356

3. Exomis pubescens sp. nov.

( Figs 3 A–D, 9C)

Type. HOLOTYPE: male, CHINA: Xizang: Linzhi , 1997.VII.5, leg. Chaodong Zhu ( IZ-CAS).

Measurement. Body length male: 5.1 mm.

Description. Body elongate. Head black, labrum and four basal antennomeres fulvous. Pronotum fulvous with a black spot at basal half, the spot rectangular, lateral sides of the spot not connecting the lateral pronotal margin, anterior margin of the spot produced in the middle. Scutellum black. Elytra black, each with a central fulvous marking which is divided into two parts: one as a short oblique band near scutellar area, one as a stripe in the middle connected to the former band and about one third of elytral width, not extending to elytral apex (with a black apical margin). Underside of body black. Legs black except ventral sides of anterior 2/3 of femora fulvous.

Head densely covered with long pubescence. Mandibles short, labrum narrow, slightly incised at anterior margin; clypeus rough, anterior margin shallowly “V”-shaped incised; frons with a median fovea, surface sparsely covered large punctures, interstices with micro punctures, area near inner sides of eyes with short wrinkles; vertex convex, covered with dense punctures. Antennae robust, extending to base of prothorax, pubescent except 3 rd antennomere, 1 st antennomere strongly elevated dorsally, 2 nd small and round, 3 rd oval, smaller than the second, 4 th triangular, 5 th – 10 th serrate, last segment long and conical.

Prothorax transverse, 1.86 times as wide as long, moderately convex; anterior margin slightly concave, lateral margins slightly arcuate, convergent anteriad, posterior margin sinuated; anterior angles rectangular, posterior ones broadly rounded, all margins including the lateral ones bordered; anterior half of surface punctation fine and sparse, posterior half with larger and denser punctures; posterior 1/3 of pronotal surface covered with long dense yellow pubescence, lateral and anterior margins also with short pubescence. Scutellum triangular, impunctate and clothed with short pubescence, apical half moderately elevated over elytral surface.

Elytra cylindrical, 1.52 times as long as wide at humeral part, humeral width as broad as prothorax; surface densely covered with confused punctures; lateral sides and apices densely clothed with yellow pubescence, disc with few pubescence.

Underside of body and legs thickly clothed with long silvery pubescence; apex of pygidium arcuate. Legs robust, tarsi broad, length ratio of protarsomeres 1.5:1.2:0.3:2.2.

Aedeagus long, bent ventrally, basal 2/3 paler and less sclerotized than apical 1/3; underside of apical part with sparse short pubescence.

Distribution: China (Xizang)

Etymology. The specific epithet is the Latin word pubescens (pubescent) and refers to the setose body surface.

Diagnosis. This new species differs from other congeneric species by the following characteristics: pronotum and elytra both pubescent; pronotum fulvous with a black rectangular spot at basal half.

Figures

FIGURE 3. Exomis pubescens sp. nov.: (A) male genitalia in dorsal view; (B) apex of male genitalia; (C) male genitalia in lateral view; (D) male genitalia in ventral view. Scales = 0.5 mm.