Parallelodemas dimetans Prena & Zhang

Prena, Jens & Zhang, Runzhi, 2014, A taxonomic revision of Parallelodemas Faust from South China (Coleoptera, Curculionidae, Baridinae), with notes on sexually dimorphic characters, Deutsche Entomologische Zeitschrift 61 (2), pp. 105-119 : 109

Parallelodemas dimetans Prena & Zhang sp. n.

Diagnosis.

This small species can be recognized by the presence of slender, bi- or trifid setae on the thoracic ventrites and ventrally glabrous male rostrum. Parallelodemas petilum is the only other known species with such setae but the male rostrum is hirsute.

Description.

Length 3.6-4.3 mm, width 1.0-1.2 mm; integument dark brown, antenna, tarsus, apex of female rostrum and often other parts of leg brown or rufous; ventral side and pygidium with simple, slender setae, thoracic sterna also with bi- and some trifid setae, basic vestiture of fine setae on pronotum and elytron, somewhat larger white setae at base of elytral interstria 3 and postmedially on interstriae 3 and 4; eyes slightly bulging; frons and base of rostrum with some recumbent setae; male rostrum 1.07 × as long as pronotum, ventrally without setae, prorostrum 0.41 –0.42× rostral length, slightly spatulate and apically diverging in dorsal view, epistome slightly notched, antennal scape with a few long setae, club 1.7 × as long as wide; female rostrum 1.02 –1.11× as long as pronotum, prorostrum 0.47 –0.51× rostral length; prosternum gradually sloping in front of coxa, basal lobe notched; all femora hirsute ventrally; tarsus with tarsite 3 relatively small and excised to basal third, tarsite 5 shorter than 2+3 and distinctly protruding beyond anterior margin of 3, male mesotarsus with long, distally pointed setae; penis 2.5 × as long as wide, apex roundly narrowed and slightly projected medially (Fig. 12), internal sac with harpoon-like sclerite and small sclerotized area near duct; spermatheca with nodulus and ramus short (Fig. 21).

Distribution.

The species is known only from China (Guizhou).

Material examined.

Holotype: China, Guizhou Province, Suiyang County, Kuankuoshui [宽阔水] Natural Reserve, Xiangguang Village [香广山村], 27.9798 N 107.1661 E, 1550 m, 4.vi.2010 [#1500871], Wang Zhiliang [王志良], male (IZCAS). Paratypes (3 males, 10 females): CHINA. Guizhou: Suiyang, Kuankuoshui Natural Reserve, Forestry Station Holiday Center, 1206 m, 5.vi.2010 [#1500879], Wang Zhiliang (IZCAS 1); Suiyang, Kuankuoshui Natural Reserve, Gongtong ravine, 6.vi.2010 [#1500880], Nie Cuie (IZCAS 1); Suiyang, Kuankuoshui Natural Reserve, Jinzi Village, 3.vi.2010 [#1500876-78], Wang Zhiliang (IZCAS 3); Suiyang, Kuankuoshui Natural Reserve, Xiangguang Village, 4.vi.2010 [#1500872-74], 8.vi.2010 [#1500875], Wang Zhiliang (IZCAS 4); Suiyang, Kuankuoshui Natural Reserve, 3.vi.2010 [#1500867-68], 4.vi.2010 [#1500869], Liu Wangang (IZCAS 3); Suiyang, Kuankuoshui Natural Reserve, Baishao ravine, 8.vi.2010 [#1500882], Nie Cuie (IZCAS 1).

Etymology.

The name is a participle presence active of dimeto (=to delimit, to mark-off; Latin).