Themus (Haplothemus) rectus Y. Yang et X. Yang

Su, Junyan, Yang, Yuxia & Yang, Xingke, 2015, Description of three new species related to Themus (Haplothemus) coriaceipennis (Fairmaire, 1889) (Coleoptera: Cantharidae), Zootaxa 4034 (2), pp. 375-389 : 383-385

Themus (Haplothemus) rectus Y. Yang et X. Yang , sp. nov.

Figs. 1 D, 3D‒F

Type material. Holotype male ( IZAS): CHINA, Hubei, Xingshan, Longmenhe, 1350m, 14.vii.1993, leg. Xiao-Lin Chen. Paratypes: CHINA, Hubei: 1 male ( IZAS): same locality as the holotype, 1300m, 13.ix.1994, leg. Jun Chen; 1 male ( IZAS): same data, 12.ix.1994, leg. Jian Yao; 5 males ( IZAS): Fujian, Wuyishan, Huanggangshan, 1800m, 28.vii.2000, leg. Ping-Fei Zhang & Zheng-Qing Fei; 1 male ( IZAS): Guangxi, Maiershan, 1900m, 14.vii.1985, leg. Su-Bai Liao; 1 male ( IZAS): Hunan, Tianpingshan, 20.vii.1988, leg. Su Lin.

Distribution. China (Hubei, Hunan, Fujian, Guangxi).

Description. Male ( Fig. 1 D). Head black, mandibles dark brown, maxilla, labium and gula yellow, darkened at maxillary and labial palpi, antennae black, prothorax yellow, pronotum with two large black markings in center of disc, which are nearly conjoint in middle, scutellum yellow, elytra black, legs black, yellow at coxae, trochanters and basal halves of femora, meso- and metasterna and abdomen yellow. Body densely covered with recumbent dark brown pubescence, mixed with slightly long semierect pubescence on elytra and a few long hairs along anterior margin of clypeus.

Head rounded, surface densely and finely punctate, lustrous; eyes distinctly protruding, head breadth across eyes distinctly wider than anterior margin of pronotum; terminal maxillary palpomeres widest at basal one-third, arcuate and sharp at apical halves of inner margins, rounded at apices; antennae extending to about basal two-fifths length of elytra, antennomeres II about 3 times as long as wide at apices, III slightly shorter than II, IV about twice as long as III, V‒XI each with an oblong to narrow longitudinal impression nearly in middle of outer margin, XI slightly shorter than X and pointed at apices.

Pronotum subquadrate, about 1.10 times as wide as long, anterior margin bisinuate, lateral margins nearly parallel, posterior margin arcuate and narrowly bordered, anterior and posterior angles nearly rectangular, disc convex at posterolateral parts, surface punctate like that on head, lustrous.

Elytra about 4.6 times longer than pronotum, 3.3 times longer than humeral width, lateral margins nearly parallel, disc coarsely and densely punctate, matt.

Aedeagus ( Figs. 3 D‒F): ventral process of each paramere narrow and nearly straight, with apex globally expanded on dorsal side and slightly hooked on ventral side in lateral view; conjoint dorsal plate of parameres moderately shorter than ventral processes, evenly narrowed apically and wider than distance between the ventral processes, largely and triangularly emarginated in middle of apical margin, each side distinctly convex at apical part of inner surface; laterophyses flattened and adhered to dorsal side of median lobe, with inner margins evenly diverging apically, outer apical angles narrowly triangular.

Body length: 17.0‒ 18.5 mm; width: 3.5‒5.0 mm.

Female unknown.

Diagnosis. This species resembles T. (H.) licenti Pic, 1938 ( Fig. 1 C) in the appearance, but can be distinguished by the aedeagus: ventral process of each paramere narrow and nearly straight. It is also similar to T. (H.) coriaceipennis ( Fairmaire, 1889) , but differs in the pronotum with two large black markings in center of disc; aedeagus: conjoint dorsal plate of parameres moderately shorter than ventral processes.

Etymology. The specific name is derived from the Latin rectus (straight), referring to a nearly straight ventral process of its aedeagus.

Figures

FIGURE 1. Habitus, dorsal view (A, C, D. male; B. female): A ‒ B. Themus (Haplothemus) coriaceipennis (Fairmaire, 1889); C. T. (H.) licenti Pic, 1938; D. T. (H.) rectus Y. Yang et X. Yang, sp. nov. Scale bars: 5.0 mm.

FIGURE 3. Aedeagus (A, D. ventral view; B, E. dorsal view; C, F. lateral view): A ‒ C. Themus (Haplothemus) coriaceipennis (Fairmaire, 1889); D ‒ F. T. (H.) rectus Y. Ya n g et X. Yang, sp. nov. Scale bars: 1.0 mm.