16. okai -group

(Fig. 21)

Diagnosis. Cercal plate oval to pointed, shorter than surstyli. Surstylus slender, bifurcate apically. Species included in this group from China are B. gentianaella (Zhong, 1985), B. cercodiscoides (Fan, Zhong & Deng in Fan, 1988a), and B. unimacula Xue & Zhang, 1996 .