Campsosternus castaneus (Jiang & Wang, 1999) Jiang & Wang, 1999

Liu, Zhen & Jiang, Shi-hong, 2019, The genus Sternocampsus Fleutiaux, 1927 (Coleoptera, Elateridae, Oxynopterinae), with description of a new species from South China, ZooKeys 852, pp. 111-124 : 111

Campsosternus castaneus (Jiang & Wang, 1999) comb.nov. Figs 1 a–c, 2 a–h, 3a, d

Sternocampsus castaneus : Jiang and Wang 1999: 34; Jiang 1993: 136 [nomen nudum].

Material examined.

Holotype of C. castaneus , China (SZPT). ♂, "Mengla (650m), Yunnan, 1982. IV.12, Jin Gentao, No. 0545".

Syntype (images) of Campsosternus argentipilis ( Candéze, 1874) (BMNH), label 1 “type”, label 2 “Siam”, label 3 "Campsosternus argentipilis Type Cdze".

Syntype (images) of C. saundersi ( Candéze, 1874) (BMNH), label 1 “type”, label 2 "Siam Laos", label 3 "Laos Mouhot", label 4 "Campsosternus saundersii Cdze Type ex coll. Saunders", label 5 "Campsosternus saundersii type", label 6 "Jancon coll. 1903-130.", label 7 " BMNH (E) #1024842".

Diagnostic note.

Based on the original description, this species has: body length 30.5-32.0 mm, elongate, chestnut brown integument, covered with silvery white pubescence (Fig. 1 a–c). Antenna (Fig. 2c) reaching beyond apex of hind angle of pronotum by length of four apical antennomeres. Pronotum 1.2 times wider than long, slightly convex, with punctures medially, spaces between punctures 5 puncture diameters wide, nearly impunctate laterally; hind angles long, acute, divergent, with a distinct carina. Scutellar shield (Fig. 2e) 1.1 times wider than long, with punctures, spaces between punctures 5 to 8 puncture diameters wide. Elytra wider than prothorax, 3.5 times longer than prothorax; convex with micro-striae, interstrial punctures sparse and smallest of all punctures on body; interstriae flat with very shallow punctures, irregularly distributed, faintly transversally rugose. Penis (Fig. 2f) narrowed to acute with sides convex near base, straight near apex, parameres with longitudinal carina, hook-like at apex.

Notes.

Based on examination of the types this species should be transferred from genus Sternocampsus to Campsosternus because of its convex and nearly square-shaped pronotum (anterior quarter 2/3 width of hind angles), the larger protruding head (less than half of eyes hidden by thorax in dorsal view) and the striate elytra. This species is similar to several dark colored Campsosternus species (cf. Fig. 3b, e: C. argentipilis ( Candéze, 1874) and Fig. 3c, f: C. saundersi ( Candéze, 1874)). They share several characters: prominent, large head with only slightly protruding frons, long pubescence, striate elytra. Furthermore, the green metallic sheen is somewhat present on the scutellum and medio-longitudinal area of the ventral part of C. castaneus (Figs 1b, 2e), shared with most Campsosternus spp. Campsosternus castaneus also differs from C. argentipilis by the density of the pubescence, punctures on pronotum and elytra, and body size, and is distinguished from C. saundersi by the shape of the pronotum, body size and ratios.

Distribution.

China (Yunnan).