affecting the Corn- Crops. 
501 
bristly, ninc-jointed, two basal joints the stoutest, oblong ; the 
third and fourth rather longer, obovate, with a gland at the apex 
appearing like a small joint; fifth obovate; sixth elongate-ovate, 
truncated, the remainder tapering; seventh oblong; eighth 
minute ; ninth twice as long, very slender, the apex pilose : face 
inclining obliquely beneath, terminated by the trophi, which 
unite and form a short beak close to the anterior coxae :* thorax 
somewhat quadrate, sometimes a little narrowed before with four 
impressed dots, two on each side ; scutellum short, somewhat 
lunate : abdomen long, narrow, and smooth, composed of nine 
segments ; apex ovate or conical and bristly, the last segment 
armed with two lateral spines in the male ; acuminated in the 
female : ovipositor or borar four-valved, incurved, compressed, con- 
cealed in the under-side of the eighth and ninth segments : wings 
four, as long as the body, narrow, horizontal, incumbent, and 
parallel in repose, but curving outward and not meeting ; superior 
rather coriaceous, fuscous, but pale at the base, ciliated with long 
haii-s, and having three longitudinal nervures ; inferior a little 
shorter, membraneous, transparent, and iridescent, likewise cili- 
ated : legs remote, anterior very short and stout in the female, 
hinder the longest; first pair of thighs thickened, but compressed 
in the female ; anterior tibiae straw-coloured in the same sex, with 
a protuberance on the inside and a curved claw at the apex ; the 
others simple ; tarsi very short, straw-coloured, biarticulate, basal 
joint oblong; second short, terminated by a little gland; claws 
none. Fig. 8 exhibits the female walking ; fig. 9 the same sex 
flying, both greatly magnified, as is shown by their natural dimen- 
sions at figs, n and q. 
I have repeatedly observed these insects running amongst the 
chaffer husks on ihe ears of wheat in great abundance, in every 
stage of growth, with the larvae of the Wheat-midge in June ; in 
August in company with the Aphides, and in July, on opening some 
barley-straw (fig. 7, a portion split longitudinally), to investigate 
the economy of the Chlorops and its parasites, I found groups of 
the orange-coloured larvae (fig. o) and the perfect black Thrips 
(fig. p) between the spathes, and the former were also secreted in 
the ears amongst the incipient grains. Mr. Kirby remarked that 
" of all the insects that are found in wheat the Thrips physapus, 
in all its states, is by far the most numerous. I do not recollect 
examining a single ear in which it was not to be found ; and my 
opinion still remains unaltered^ that it derives its nourishment from 
the grain." | 
* For descriptions andfigures of the mouth, antennae, &c., consult Cur- 
tis's Brit. Ent., fol. and pi. 748. 
t Linn. Trans., vol. iv. p. 239. 
