Parallelodemas tumens 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 : 112-113

Parallelodemas tumens Prena & Zhang sp. n.

Diagnosis.

Besides Parallelodemas tardum , this is the only known species without split setae on the metepisternum and without a modified male mesotarsus. Parallelodemas tumens is smaller (<5 mm) than Parallelodemas tardum and has a longer rostrum with a more basally inserted antenna. Differences in the genitalia are not apparent. Female Parallelodemas tumens may be distinguished from female Parallelodemas perfectum and Parallelodemas tardum by smaller body size. All three species have specimens with a more or less tumescent prosternum.

Description.

Length 3.8-4.8 mm, width 1.1-1.3 mm; integument black, antenna, tarsus, apex of female rostrum and often other parts of leg brown or rufous; ventral side and pygidium with undivided setae, basic vestiture of fine setae on pronotum and elytron, moderately wide white setae at base of elytral interstria 3 and postmedially on interstriae 4 and 5, on thoracic flank and basolateral angles of pronotum; eyes flush with head contour; frons and base of rostrum glabrous; male rostrum 1.06 –1.08× as long as pronotum, ventrally without setae, prorostrum 0.41 –0.42× rostral length, slightly spatulate and apically diverging in dorsal view, epistome short and truncate, antennal scape glabrous, club 1.8 × as long as wide; female rostrum 1.20 × as long as pronotum, prorostrum 0.53 × rostral length; prosternum tumescent in front of coxae, basal lobe notched; pro- and mesofemora hirsute ventrally; tarsus with tarsite 3 of moderate size and excised to basal third, tarsite 5 slightly longer than 3 and distinctly protruding beyond anterior margin of 3, male mesotarsus without specialized setae; penis 2.5 × as long as wide, apex lancet-shaped and broadly rounded (Fig. 18), internal sac with 2 small sclerites (hook and paired hook); spermatheca with nodulus and ramus short (as Parallelodemas dimetans , Fig. 21).

Distribution.

The species is known from the Chinese province Guizhou.

Material examined.

Holotype: China, Guizhou Province, Libo County, Banzhai Village [板寨村], 24.v.1998, Zhang Runzhi [张润志], #1500884, male, dissected (IZCAS). Paratypes (2 males, 1 female): CHINA. Guizhou: Libo County, Banzhai Village, 24.v.1998, Zhang Runzhi [#1500883] (IZCAS 1); Yunyi Prefecture, Suiyang County, Kuankuoshui Natural Reserve, 3.vi.2010 [#1500881], 4.vi.2010 [#1500870], Nie Cuie (IZCAS 2).

Etymology.

The name is a participle presence active of tumeo (=to inflate, to distend; Latin).