282 Mr. R. 8. Bagnall on Thysanoptera 
excepting the fore-tarsi which are yellowish. Wings practi- 
cally clear, exhibiting but the slightest trace of a sulphurous 
yellow tinge ; cilia dusky. Antenne (excepting the two 
basal joints) unfortunately lost in the unique example. 
Head long and slender, 3°3 times as long as broad at 
base. Eyes occupying about 0°2 and the produced part 0°12 
of the total length. Postocular and anteocular bristles 
rather long ; genal spines few, three pairs (one immediately 
behind eyes, one near middle, and one basal) prominent. A 
dorsal pair of bristles on the same line as the mid-lateral 
genal spines. 
Pronotum about 0°45 the length of the head and 1°6 times 
as broad as long. Apparently only the postero-marginal 
sete prominent and those of the outer pair are seemingly 
less than 0°3 the median length of the pronotum. Fore- 
coxa produced, forming a seat for the coxal spine. Fore- 
femora strongly incrassate, armed with some stout setz on 
outer margin near base ; fore-tibia stout, distal inner angle 
sharp ; fore-tarsus with a stout broadly-seated tooth. Wings 
with closely ciliated margins, fore-wings with forty-nine 
duplicated cilia. 
Abdomen gradually narrowing from base, no great dis- 
parity between the lengths of segments 7 and 8, the latter 
being the longer. Tube approximately 0°6 the length of the 
head ; terminal hairs weak distally and about 0°75 the 
length of the tube. Abdominal bristles light-coloured and 
moderately long; those on segment 9 about 0°8 the length 
of the tube; the longest on 4 to 7 only from 0:4 to 0°5 the 
length of those on 9. 
D. rex is the same length as, and can only be compared 
with, an East African species, D. stenocephalus, Bagn., from 
which it is readily separated by numerous differences in the 
chetotaxy. The ante- and postocular bristles are longer in 
D. stenocephalus, whilst all the pronotal sete are well de- 
veloped. On the other hand, the genal set in that species 
(stenocephalus) are shorter without the markedly outstanding 
pairs, other than the pair immediately behind the eyes, and 
more numerous. The hind and intermediate femora and 
tibiz in both species are furnished with rows of short setz, 
which in D. rex are distinctly shorter and more slender and 
therefore less noticeable than in D. stenocephalus. D. rex is 
a stouter insect, the front femora are longer and much more 
incrassate, and the width (12:5, as compared with 10: 4) of 
the pterothorax is about one-fifth (0°) greater than in 
D. stenocephalus. 
