trifurcata species group

Diagnosis. Wing veins R2+3 and R4+5 with distinctly swollen basal portion. Lateral lobe on epandrium long, finger-like, apically with thick bristle, basally with 1–2 bristles; ventral lobe of surstylus with bifurcated apex; cercus without distinct basal tubercle; hypandrium symmetrical in ventral view.

Remarks. Only three species are known so far, two from Chinese mainland and one from Taiwan.