354 



C. B. WILLIAMS. 



obtuse-angled triangle, the anterior ocellus directed forward. Ocellar spines short 

 and weak, outside the line joining the anterior and posterior ocelli ; a longer spine 

 on the frons near the margin of each eye ; a spine behind each posterior ocellus, and 

 a row of one long and about three short ones behind each eye. The hind part of the 

 head distinctly striated ; the hind margin heavily chitinised. The mouth-cone very 

 long, reaching right across the prosternum. The maxillary palps rather long, three- 

 segmented, the basal segment the longest ; relative lengths of the segments 

 approximately 8:4:6; about four sense hairs at the apex of the third segment. 



Fig. 



Thrips oryzae, Williams, sp, n. ; a, head and protliorax ; b, antenna ; 

 c, fore wing ; d, apex of abdomen, dorsal view. 



Labial palps two-segmented, the basal segment very short. Antennae (fig. 1, b) not 

 quite twice as long as the head, rather stout. The first segment short and broad ; 

 the second almost as wide but longer, tapering at each end, but more so at the base ; 

 the third much narrower and with a distinct pedicel ; the fourth a little shorter than 

 the third, rapidly constricted just above the base ; the fifth with a broad apex and 

 constricted at the base as in the fourth ; the sixth as long as or very slightly longer 

 than the third (with the pedicel) ; the seventh half as long as the sixth and twice as 

 broad as long. Forked trichomes on the third segment dorsally and the fourth 

 ventrally. Colour : the first, fifth, sixth and seventh segments uniformly about as 

 dark as the body, the second and fourth a little paler, particularly the apex of the 

 former, the third still a little paler, especially towards the base. 



