Ceresium coloratum, Yokoi, 2019

Ceresium coloratum View in CoL sp. nov.

Figs 10, 22A- I

Types. Holotype Ƌ: “N-Sumatra, Aik Tarum, Diehl, 1.I-84” ( ZSM).

Diagnosis. Similar to C. mediocre Holzschuh, 2011 from Borneo, differing in colour, hair and genital organs.

Etymology. The name of this species refers to the homogeneously testaceous colouration.

Description

Measurements. TL = 10.0 mm; EL/EW = 2.94; HW/PW =1.0; PL/PW=1.1; PA/PW=0.76;PB/PW =0.96.

Colour. Homogeneously testaceous; solely antennae are a little paler. Eyes dark grey.

Head. Similar to that of C. mediocre . Vertex and occiput less setose with sporadic short hairs. Antennae a little longer, reaching elytral apices by 9 th article.

Pronotum. Similar as of C. mediocre in outline and as of C. contiguum Holzschuh, 2015 in puncture. The two glossy callosities near latero-apical corners smaller; basal ones more transversal and nearer to base. Distinctly less setose; sparsely clothed with pale, short, adpressed hairs which grow a little thicker toward sides.

Scutellum as of C. zeylanicum .

Elytra and legs. Similar as those of C. mediocre .

Venter. Prosternum convex; furnished with several large, deep punctures; clothed with sporadic short hairs near middle; more thickly so with longer hairs near sides. Prosternal process narrow, feebly emarginated on apex. Mesosternum concave in the apical middle; impunctate; setae as prosternum. Mesosternal process moderate in width; feebly concave in middle; dilated toward apex which is deeply emarginated in middle. Metasternum widely shiny in middle; setae as mesosternum.

Abdomen. Surface as of metasternum, though hairs on sides less thick. 5 th visible sternite short; widely emarginated on apex.

Genital organs as in Figure 22A- I View Fig . Median lobe about 9 / 20 the length of abdomen; bullet-shaped in dorsal view though a little emarginated in the basal half; arcuate in profile; dorsal plate dehiscent in basal 6 / 7; ventral plate longer than dorsal plate, dehiscent in basal 7 / 8; median struts apicad dilated. Tegmen about 8 / 9 the length of median lobe. Parameres about 9 / 20 the length of tegmen; apicad gradually narrowed; dehiscent in apical 3 / 10; clothed with long setae on apices. Ejaculatory duct complex as in Figure 22F- H View Fig ; slender; apical sclerite dehiscent, with each lobe bent downward and hooked; basal sclerite long and slender; extensively dehiscent.8 th sternite rather sharply narrowed apicad; apex widely emarginated in semi-circular form; latero-apical corners bluntly edged; clothed sparsely with short setae on and near apex. 8 th tergite as wide as the corresponding sternite; semi-trapezoidal; clothed with short to medium hairs on apex and adjacent sides.

Distribution. North Sumatra, Indonesia.

Comparative notes. This new species from Sumatra resembles C. mediocre from Borneo in many aspects, above all regarding the structure of head, body and legs. It can be distinguished, however, by its homogenous colouration as well as by the distinctly less setose pronotum. In addition, its 8 th sternite is emarginated in semi-circular form on apex, differing from the sternite of C. mediocre , which is emarginated in shallow U-form with acute latero-basal edges.

Remarks. The holotype was found among “indet.” specimens in “Hüdepohl Collection” (ZSM).