Lathrobium baishanzuense Peng & Li sp. n. Figs 1A3

Type material

(2 ♂♂). Holotype: ♂, labeled 'CHINA: Zhejiang Prov. / Qingyuan County / Baishanzu N. R. / 27°45'N, 119°13'E / 22-23.ix.2008, alt. 1,500 m / Tang & Zhang leg.'. Paratypes: 1 ♂, same label data as holotype, but ' 27°45'N, 119°12'E / 6.v.2004, alt. 1,400-1,700 m / Hu, Tang & Zhu leg.'.

Description.

Measurements and ratios:BL 8.50-9.30, FL 3.00-3.63, HL 1.13-1.15, HW 1.26-1.31, PL 1.48-1.54, PW 1.30-1.35, EL 0.98-1.00, HL/HW 0.88-0.90, HW/PW 0.97, HL/PL 0.75-0.76, PL/PW 1.14, EL/PL 0.65-0.66.

Habitus as in Fig. 1A. Body brown with paler apex, legs light brown, antennae brown to light brown.

Head subquadrate (HL/HW 0.88-0.90); punctation coarse and sparse; interstices with very shallow microreticulation; eyes small, approximately 1/4-1/3 the length of postocular region in dorsal view.

Pronotum nearly parallel-sided; punctation sparser than that of head; impunctate midline broad; interstices without microsculpture.

Elytra with punctation denser than that of pronotum and well defined; hind wings completely reduced.

Abdomen with dense punctation; interstices with very shallow, transversely striate microsculpture.

Male. Sternite V (Fig. 3A) with dark setae in postero-median impression and posterior margin with several point-like setae; sternite VI (Fig. 3B) with sparse, short setae in postero-median impression and posterior margin with 7-8 peg-like setae; posterior margin of sternite VII (Fig. 3C) weakly concave, pubescence unmodified; sternite VIII (Fig. 3D) with deep asymmetric emargination and blackish setae along both sides of this emargination; sternite IX (Fig. 3E) asymmetric; aedeagus (Fig. 3F, 3G) with asymmetric, apically truncate ventral process, short and moderately sclerotized dorsal plate, and without sclerotized spines in internal sac.

Female. Unknown.

Distribution.

East China: Donggong mountain range.

Etymology.

The specific epithet is derived from the type locality “Baishanzu” .

Comparative notes and comments.

Two distinct species groups occur in Baishanzu. One of these groups includes Lathrobium baishanzuense, the three following species from Baishanzu, and additionally Lathrobium daicongchaoi Peng & Li, 2012 from Guadun, Lathrobium fujianense Peng & Li, 2012 from Junzifeng Shan, Lathrobium longwangshanense Peng, Li & Zhao, 2012 from the Longwangshan, Lathrobium tianmushanense Watanabe, 1999 from the Tianmushan and the Longwangshan, Lathrobium zhaotiexiongi Peng & Li, 2012 from Jiulongshan Natural Reserve and Majian, and Lathrobium jiulongshanense Peng & Li, 2012 from Jiulongshan Natural Reserve. The species group is characterized by a male sternite V with a postero-median impression with dense dark setae and male sternites III–IV with conspicuously modified setae in the posterior or postero-median impression in some species, evident synapomorphies constituting the monophyly of this species group. These characters appear to be unique among Chinese Lathrobium .

Among the species of this group, Lathrobium baishanzuense is characterized particularly by the conspicuous modifications of the male sternite VIII and the morphology of the aedeagus.