278 Mr. R. §. Bagnall on Thysanoptera 
Genus Liorurirs, Uzel, 
16. Liothrips nigricornis, sp. n. 
(Pl. V. figs. 7-9.) 
Length 3°5 to 4°2 mm. 
Colour black, shining ; fore-tibize, all knees and tarsi 
chestnut-brown; antennze black with the extreme base and 
apex of joimt 3 very narrowly and scarcely noticeably 
yellowish. 
Head approximately 1-6 times as long as broad across 
base of eyes, where it is broadest, swollen dorsally, and 
narrowed towards neck. Surface irregularly transversely 
striate. Eyes small, occupying about 0:2 the dorsal length 
of head ; finely facetted. Ocelli large, not touching inner 
margins of eyes; anterior ocellus forwardly directed. 
Minute inter- and post-ocellar set present ; postocular 
bristles rather long. Cheeks sparingly and minutely setose. 
Mouth-cone reaching beyond prosternum. Antenne about 
1-8 times the length of the head ; relative lengths of joints 
3 to 8 as follows :—17: 16: 14:10:7:4, 3 and 4 broader 
than 5, 3-5 mildly clavate ; 6 fusiform; 7 and 8 rather 
broadly united with 8, obconical or obpyriform. 
Prothorax transverse, less than 0°5 the length of head, 
and twice as broad as long; setz light-coloured, rather 
short, excepting those on posterior margin, the outer pair 
(at posterior angles) of which are about 0-7 the length 
of the prothorax. Prothorax broader than width across 
fore-coxee, about as long as broad. Wings tinted with 
yellow ; median veins brownish-yellow ; cilia smoky. Fore- 
wing slightly narrowed in the median fifth, where it is about 
one-twelfth as broad as long. Cilia close, with a long 
duplicated series of over 40. Fore-legs with femora in. 
crassate ; tibia stout and tarsus armed with a strong tooth. 
Hind and intermediate tibise with a moderately long fine 
seta on the outer margin below knee (in basal third) and 
another near apex. 
Abdomen scarcely broader than pterothorax, narrowing 
gently from segment 4. Tube long and ‘rather stout ; about 
1-2 times as long as the head, more than 4 times as long 
as broad at base, gently narrowing to apical fifth and then 
somewhat markedly constricted before apex ; terminal hairs 
not strong, yellowish-brown basally ; about or a little more 
than 0°5 the length of tube. Lateral abdominal bristles 
long and strong, yellow to dusky yellow. Longest pair of 
