Key to males of the Microphorella arcana species group

1 Mid femur without cluster of long basiventral setae.......................................... Microphorella sp. B

- Mid femur with cluster of 6 long basiventral setae (Figs 106, 107, 109)........................................... 2

2 Abdominal sternite 5 with transverse row of about 6 long curved setae near posterolateral margin (Fig. 108), sternite 6 with bulbous lateral projection (Fig. 107)........................................................ M. arcana sp. nov.

- Abdominal sternite 5 and 6 not modified as above........................................................... 3

3 Hind femur with posterior patch of setae dense and brush-like (Fig. 109); hypopygium (Figs 112, 113) with hypandrium large and egg-shaped, dorsal lobe of surstylus with claw-like process adjacent to cercus..................... M. ovata sp. nov.

- Hind femur with posterior patch of setae less dense (similar to Fig. 107); hypopygium (Figs 110, 111) with hypandrium smaller, dorsal lobe of surstylus lacking claw-like process adjacent to cercus............................. M. gilaensis sp. nov.