Key to species of Monomalpha Emeljanov

1 First hind tarsomere with fourth tooth (counted from the outer side) longer (= protruding further towards second hind tarsomere) than third tooth (Fig. 6E); base of third tooth freely visible, not covered by fourth tooth; second hind tarsomere usually with 7 apical teeth (Fig. 6E)............................................................. M. stenocara sp. nov.

– First hind tarsomere with fourth tooth (counted from outside) shorter (= protruding less far towards second hind tarsomere) than third tooth (Figs 3F, 5F); fourth tooth elevated, covering base of third tooth (Figs 3F); second hind tarsomere usually with 6 apical teeth (Fig. 3F)................................................................................. 2

2(1) Frons about as long as wide (in widest part) (Fig. 3D). Male genital styles in apical portion deeply emarginate (Fig. 9F). MP1+2 bifid (Figs 3A, 3B), rarely unforked............................................. Monomalpha fletcheri Emeljanov

– Frons at least 1.5x longer than wide (in widest part) (Fig. 5D). Male genital styles in apical portion very shallowly emarginate (Fig. 10E). MP1+2 unforked (Figs 5A, 5B)....................................... Monomalpha gratiosa Emeljanov