from the Seychelles Islands and Rodrigues. 269 
head, 1°9 times as long as broad at base, where it is 1°75 
times as broad as at apex. Abdominal sete as in mahensis. 
6 .—Smaller and more slender ; fore-femora more strongly 
incrassate ; abdominal chetotaxy stronger and modified as 
is usual in the g; segment 9 with a spine-like seta near 
each posterior angle. 
Differs from mahensis in its larger size, the length of the 
head, and from both karnyi, Bagn. (East Africa), and brevi- 
collis, Bagn., inthe shorter tube. In karnyi the cephalic and 
pronotal sete are very long and somewhat slender, whilst 
the head is comparatively narrower (12 : 14) than in silhouet- 
tensis. 
Loe, Srycuei.es. Silhouette: Mare aux Cochons plateau, 
September 1908, 5 9 and3 @. 
Genus ACALLUROTHRIPS, nov. 
Size small, belonging to the Cryptothrips group, wherein 
the wings are more or less parallel-sided and never con- 
stricted near middle as in the Haplothrips group. Head as 
long, or scarcely as long, as broad, and not noticably longer 
than the prothorax ; mouth-cone massive, reaching beyond 
posternum. Antenne about twice as long as thé head, 
intermediate joints short, 7 and 8 connate. Tube curiously 
unformed, basal half more or less longitudinally ribbed, and 
extreme apex very sharply constricted; terminal hairs weak. 
Wings simple, without duplicated cilia in the fore-wing. 
Type. Acallurothrips macrurus, mihi. 
7. Acallurothrips proturus, sp. n. 
(Pl. V. figs. 3, 4.) 
Length 1°35 inm., breadth of pterothorax 0:27 mm. 
Blackish-brown, shining ; legs dark chestnut-brown, fore- 
tibie shaded to yellow and all tarsi yellowish. Wings 
brownish-yellow with cilia smoky-brown. 
Head with cheeks subparallel, practically as long as broad ; 
eyes moderately finely facetted, occupying about 0°35 the 
length of the head ; ocelli widely separated, the posterior 
pair almost touching the inner margins of the eyes on about 
a line across their centre ; anterior ocellus forwardly directed. 
Postocular bristles short. Antenne broken off in the 
unique specimen. Mouth-cone conical, large, reaching 
across the prosternum. 
Prothorax transverse, about 0°75 the length of the head 
