Key to species of Leucothrips in Japan

1. Fore wing dark (Fig. 2); sculpture on pronotum and metascutum with minute fringe (Figs 14, 16); metascutal sculpture not lon- gitudinal at least posteromedian part, interval of lines as wide as or wider than diameter of setae.............. nigripennis

-. Fore wing uniformly pale (Fig. 1); sculpture on pronotum and metascutum without fringe (Figs 11, 19); metascutal sculpture with closely spaced longitudinal lines, interval of lines narrower than diameter of setae.............................. 2

2. Antennal segments III and IV with simple sensoria in both sexes (Fig. 18).................................... piercei

-. Antennal segments III and IV with forked sensoria in female (Fig. 12)...................................... furcatus