Key to genera of Scirtothrips -genus group in Japan

1. Antennae 6-segmented (Fig. 4B) ....................................................................................... Drepanothrips

-. Antennae 7- or 8-segmented (cf. Figs. 1 B, 11B–C)................................................................................. 2

2(1) Antennae 8-segmented ............................................................................................................ Scirtothrips

-. Antennae 7-segmented ............................................................................................................................. 3

3(2) Abdominal terga and sterna with numerous ciliate microtrichia along lines of sculpture; tergal B1 setae much longer than distance between their bases (Fig. 2 B); antennal segment II with two apical distal setae equal in size (Fig. 1 B); mesonotum with median and submedian setae situated in front of posterior margin (Fig. 1 C); mesospinasternum narrow but complete (Fig. 2 A) .............................. Anascirtothrips

-. Abdominal terga and sterna without numerous ciliate microtrichia; tergal B1 setae much shorter than distance between their bases (Figs. 7 B & 8A); antennal segment II with inner dorsal apical seta much longer than outer seta (Figs. 6 B–C); mesonotum with submedian setae situated near posterior margin (Fig. 6 D); mesospinasternum eroded at middle (Fig. 7 A) ...................................... Parascirtothrips nov.