A NEW THRIPS DAMAGING COFFEE IN BRITISH EAST AFRICA. 271 



palps apparently one-segmented, but with sometimes a doubtful second short basal 

 segment indistinctly separated from the labium. Antennae (fig. 1 c) eight-segmented, 

 rather long and slender, more than twice the length of the head : The first segment 

 short and broad, very slightly tapering to the apex ; the second longer and narrower, 

 barrel-shaped ; the third longer than the second, with a distinct pedicel at the base 

 and tapering to a short neck at the apex ; the fourth longer than the third, and with 

 the apical neck longer ; the fifth shorter than the third and without the constricted 

 apex ; the sixth slightly shorter than the fourth ; the eighth longer than the 

 seventh, the two together being about half as long as the sixth ; forked trichomes 

 on the third segment dorsally and on the fourth ventrally, the latter the longer. 

 Colour : the first, second, sixth, seventh and eighth uniformly brown, a little darker 

 than the body, the third and fourth brown except at the apex, the fifth paler at 

 the base. Near the base of the fourth and fifth segments is a clear ring which 

 separates off a narrow darker ring at the base ; this varies in distinctness in individual 

 specimens (see above). 



Prothorax almost as long as and only about one- quarter w^ider than the head, 

 with the sides nearly parallel. Two long slender spines at each hind angle, shorter 

 ones on the fore and hind margins and a number of still shorter weak spines scattered 

 over the pronotum. Pterothorax rather slender, angles rounded in front. Legs 

 long and slender, paler than the body, the femora darkened in the middle. Fore 

 femora not swollen ; tarsi unarmed. Wings long and slender. Two longitudinal 

 veins present in the front wing (fig. 1 d), the hind vein arising from the fore vein 

 about one- quarter of the wing length from the base. On the costa 24-27 spines ; 

 on the fore vein 3 at the base, 2 at the level of the origin of the hind vein and 2 near 

 the apex ; on the hind vein 14-16. The anterior marginal fringe commences just 

 distal to the fork of the veins ; the posterior fringe at its greatest length is about 

 seven and a half times the width of the wing. Colour pale yellowish, with an 

 indistinct dark area at the level of the origin of the hind vein and a second, more 

 distinct in the posterior half of the wing, about half way between the first and the 

 apex. Spines on the wing pale, except those arising in the dark areas which are 

 darker. Hind wings clear, with a single vein only distinct in the basal half of the 

 wing. Abdomen slender, tenth segment short, only about two-thirds the length of 

 the ninth, spines at the apex pale and slender, those on the ninth and tenth segments 

 being about equal in length. 



Male. 



Paler than the female and about one-fifth smaller. In the antennae the first 

 two segments are clear, also the bases and apices of segments 3 and 4 and the base 

 of 5 ; 6-8 are uniformly brown, but not so dark as in the female. On the costa of 

 the fore wing are usually 22-24 spines, on the fore vein as in the female, and 12-14 

 on the hind vein : one male, however, has only 20 on the costa and 7 on the hind 

 vein of one wing and 21 and 9 respectively on the other wing. There is no indication 

 of clear areas on the abdominal sternites and there are no stout dorsal spines on 

 the ninth tergite. 



Measurements. — ^Head, length 0*100 mm., width 0*102 mm. ; prothorax, length 

 0-080 mm., width 0*130 mm. ; pterothorax, length 0*20 mm., width 0*164 mm. Total 

 body length 0*97 mm., antennae 0*240 mm. 

 (C205) e2 



