Key to species (males) of Mesorhaga in Himalayan region

1 Femora yellow [India]........................................................... M. albiflabellata Parent, 1944

- Femora black......................................................................................... 2

2 Hind tibia yellow; hypandrium elongate but simple; surstylus wide and short; cercus curved, constricted at middle, round api- cally (Yang et al. 2011, fig. 148) [China]............................................... M. grootaerti Yang, 1995

- Hind tibia black; hypandrium elongate, broad apically; surstylus bifurcated; cercus curved, thin apically (Yang et al. 2011, fig. 155) [China].................................................................... M. xizangensis Yang, 1995