Key to Ctenothrips species

1. Postocular setae not arising in a single row, pair II slightly in front of pairs I & III, pair III arranged far behind I & II (Fig. 5); ocellar setae pair III arising posterior to ocellar triangle; pronotum with transverse lines; male with one pair of thorn-like setae on tergite IX (Fig. 49)............................................ transeolinae [southern China and northern India]

-. Postocular setae arising almost in a row; pair III missing (Fig. 2); ocellar setae pair III arising within ocellar triangle, at least in front of posterior margin of hind ocelli; pronotum without obvious sculpture, sometimes with a few weak reticulations; male tergite IX with 2 pairs or no thorn-like setae................................................................ 2

2. Male tergite IX with two pairs of thorn-like setae (Fig. 48), the upper pair longer; female body about 2.8 mm long; pronotum generally with one pair of posteromarginal setae, occasionally 2 pairs (Fig. 19)............ parisae sp.n [southwest China]

-. Male tergite IX without thorn-like setae (Fig. 47); female body no more than 2.7 mm long, usually 2.0– 2.3 mm; pronotum with two pairs of posteromarginal setae........................................................................ 3