Key to the known Cacopsylla nymphs on Pyrus ussuriensis in China

1. Fore wing pad with only 1 capitate seta at outer margin; ventral surface of hindwing pad nearly completely covered with micro spinules; 3+3 lateral free sclerites bearing a spiracle each present in ventral surface of abdomen (Fig. 17); 3 pairs of sectasetae present in abdominal margin (Fig. 17)...................................... C. (Thamnopsylla) burckhardti sp. nov.

-. Fore wing pad with a line of 9–12 capitate setae along outer margin (Figs 30, 41); ventral surface of hindwing pad covered with micro spinules only in anterior half; 2+2 lateral free sclerites bearing a spiracle each present in ventral surface of abdomen; abdominal margin without sectasetae (Figs 30, 41)....................................................... 2

2. Setae in wing pad margin and abdominal margin relatively longer (Fig. 30); tarsal arolium relatively wider (Fig. 32); outer circum-anal ring depressed laterally (Fig. 31)............................................ C. (Hepatopsylla) chinensis

-. Setae in wing pad margin and abdominal margin relatively shorter (Fig. 41); tarsal arolium relatively narrower (Fig. 43); outer circum-anal ring not depressed laterally (Fig. 42)........................... C. (Hepatopsylla) cinereosignata sp. nov.