Key to genera of Megaesthesiinae

1. G2 long, exceeding G1 length; basal, distal segments long (Fig. 82 C, F, M)............................ Megaesthesius

- G2 short, about 2/3 length of G1; basal segment short, distal segment spatuliform with short elongation (Fig. 83 C)............................................................................................. Alainthesius n. gen.