Batraxis bicolor Wang and Yin, 2016

Wang, Dan & Yin, Zi-Wei, 2016, New species and records of Batraxis Reitter (Coleoptera: Staphylinidae: Pselaphinae) in continental China, Zootaxa 4147 (4), pp. 443-465 : 455-456

Batraxis bicolor Wang and Yin, 2016

( Figs 6 B, 13A–C, 14E, 14U, 15)

Batraxis bicolor Wang and Yin (in Wang et al. 2016: 2) .

Type locality: China, Hainan, Qiongzhong Hsien, Limu Mt. , 19°10'04"N, 109°44'45"E, 625 m.

Additional material examined (14 ƋƋ, 17 ♀♀). 1 Ƌ, labeled ‘ CHINA: Yunnan Province, Lincang City, Yun Hsien, Manwan , Town , Manjiu Village (慢旧村), 24°42'31''N, 100°22'44''E, rotten wood, alt. 1371 m, 9.iv.2016, Zi-Chun Xiong leg.’ ( SNUC) ; 5 ƋƋ, 3 ♀♀, labeled ‘ China: Yunnan, Lincang City, Yun Hsien, Manwan Town , Guiziba Village , 24°43'48"N, 100°20'01"E, rotten wood, alt. 1243 m, 19.iv.2016, Zi-Chun Xiong leg.’ ( SNUC) ; 8 ƋƋ, 14 ♀♀, same data as previous material except ‘ 20.iv.2016 ’ ( SNUC) .

Comments. The population of Batraxis bicolor from Hainan has reddish brown head, pronotum, and elytra and a much darker abdomen (Wang et al. 2016) which is stable in all available individuals, while the population from Yunnan ( Fig. 6 B) are uniform in color (darkish brown). Furthermore, the aedeagal endophallus of the population from Hainan is strictly symmetric, but in the population from Yunnan, it is slightly asymmetric ( Fig. 13 A–C). The above differences are interpreted as intraspecific variation of this species. Otherwise, the long protuberance of the protrochanters ( Fig. 14 U) and small preapical tooth of the protibiae ( Fig. 14 E) are stable in both populations. Batraxis bicolor is similar to B. splendida Nomura from Japan and Korea, but the latter species lack a protuberance on the protibiae.

Measurements of the population from Yunnan: male—BL 2.00– 2.17 mm, HL 0.42–0.43 mm, HW 0.42–0.43 mm, PL 0.39–0.42 mm, PW 0.43–0.47 mm, EL 0.50–0.54 mm, EW 0.83–0.84 mm, AL 0.71–0.79 mm, AW 0.78– 0.85 mm, width between discal carinae of tergite IV 0.38–0.44 mm at apices, length of the aedeagus 0.49 mm; female—BL 1.83–2.05 mm; HL 0.38–0.40 mm; HW 0.39–0.40 mm; PL 0.35–0.39 mm; PW 0.42–0.44 mm; EL 0.45–0.49 mm; EW 0.74–0.81 mm; AL 0.65–0.77 mm; AW 0.74–0.82 mm; width between discal carinae of tergite IV 0.38–0.42 mm at apices.

Distribution. China: Yunnan (new provincial record), Hainan ( Fig. 15 ).

Figures

FIGURE 6. Dorsal habitus of Batraxis males. A. B. ziyueae. B. B. bicolor, population from Yunnan. Scale bars: 0.5 mm.

FIGURE 13. Aedeagi of Batraxis species. (A, B, D, E. in ventral view. C, F. in lateral view). A – C. B. bicolor, population from Yunnan. D – F. B. tibialis, population from Jiangxi. Scale bars: 0.1 mm.

FIGURE 14. Legs of male Batraxis species. (A – F. Protibia. G. Mesotibia. H, I. Profemur. J – V. Protrochanter). A, K. B. gloriosa, population from Fujian. B, L. B. gloriosa, population from Zhejiang. C, H, P. B. gesar. D, T. B. ziyueae. E, U. B. bicolor, population from Yunnan. F, I, V. B. tibialis, population from Jiangxi. G, S. B. yifan. J. B. gloriosa, population from Hunan. M. B. gloriosa, population from Jiangxi. N. B. gloriosa, population from Guangxi. O. B. longicornis. Q. B. longithorax. R. B. nanlingensis. Scale bars: A ‒ I = 0.1 mm; J ‒ V = 0.05 mm.

FIGURE 15. Distribution of Batraxis species in China.