2IO NEW GENERA AND SPECIES OF THYSANOPTERA 



limbs almost naked, the bristles and hairs being of the 

 minutest description. 



Abdomen simple, extremely long and slender, being three- 

 quarters the length of the whole insect, and about one-twelfth 

 as wide at base as it is long ; tapered gradually to tube from 

 the seventh segment. Tube very slender, four times the 

 length of the ninth abdominal segment, or equal in length to 

 segments seven to nine together, and twice as long as the 

 head. Terminal hairs short and weak ; spines on abdomen 

 white, short and stout, those at the apical angles of each 

 segment being the longest. 



^. A specimen which appears to be the male is smaller and 

 more slender, whilst the antennae are comparatively shorter 

 and stouter. The fore-femora are not thickened, though the 

 tarsal spur appears to be very slightly stronger. It is un- 

 fortunately difficult to discriminate the sexes in dried and 

 carded specimens. 



Type — In British Museum. 



Hab. — Bangkok, Siam, three specimens. 



Genus IDOLOTHRIPS Haliday 

 Idolothrips quadrituberculata sp. n. (PL VII., fig. 9). 



?. Length about 4 mm. ; breadth of mesothorax o*6 mm. 



Colour very dark brown, almost black ; femora brown ; 

 tibiae and knees yellow shaded with a band of brown below 

 (each knee : tarsi yellow shaded with brown ; antennae (ex- 

 cepting basal joints) yellow ; joints tinged with brown at 

 apices. Antennal joints 6-8 broken off in the type specimen. 



Head cylindrical, twice as long as wide; surface finely 

 striated transversely. Cheeks set with but a few short slender 

 spines; head broadened a little just before the constriction at 

 base ; vertex produced into a prominent conical hump in front 

 of the eyes, which does not over-reach the insertion of antennae. 

 Eyes larger, rather finely faceted, bulging slightly. Ocelli 

 large, comparatively widely separated ; the posterior pair just 



