Key to Japanese Ametrodiplosis species

1- Male flagellomeres VIII–IX with bare constrictions (Fig. 13); pupal antennal bases with tiny umbo-like protuberance (Fig. 22); larval spatula with rounded lobes (Fig. 24)............................ A. adetos Elsayed, Yukawa & Tokuda, n. sp.

- Male flagellomeres VII–IX with bare constrictions (Figs 30, 49); pupal antennal bases with elongate protuberances; larval spatula with pointed lobes (Figs 41, 60)................................................................... 2

2- R 5 slightly curved distally (Figs 6, 7); female cerci with scattered setae (Fig. 35); gonostylar ventral microtrichia restricted to basal half of gonostylus; basal part of aedeagus not exceeding beyond base line of gonocoxite anteriorly (Figs 37, 38); pupal antennal bases with serrate protuberance (Fig. 39); anterior lobes of larval spatula slightly wider than shaft (Fig. 41); larval terminal segment with tiny verrucae dorsally (Fig. 43).............. A. aeroradicis Elsayed, Yukawa & Tokuda, n. sp.

- R5 strongly curved distally (Figs 8, 9); female cerci with setae on distal half (Fig. 54); gonostylar ventral microtrichia restricted to basal third of gonostylus; basal part of aedeagus exceeding beyond base line of gonocoxite anteriorly (Figs 56, 57); pupal antennal bases with pointed triangular protuberance (Fig. 58); anterior lobes of larval spatula considerably wider than shaft (Fig. 60); larval terminal segment with wide verrucae dorsally (Fig. 62)... A. stellariae Elsayed, Yukawa & Tokuda, n. sp.