THYSANOPTERA. — THRIPIDE. 3 
” 
«Vensemble de leur organisation 
Homoptera than the Orthoptera.* 
The figures given above are the first which have yet been tibia 
lished of the parts of the mouth in detail! of these curious insects. 
appeared more allied to the 
The prothorax is large, depressed, and more or less narrowed in 
front, its hind part being broader than the head ; the meso- and meta- 
thorax are large, flat, and closely soldered together, the former being 
often the shorter, and transverse; the meso-scutellum is not a con- 
spicuous piece; the four wings are nearly alike, the anterior pair 
{ fig. 57.11.) being rather larger than the posterior (jig. 57.12.) ; they 
are ordinarily narrow, membranous, and without nerves, crossing and 
resting horizontally upon the back, and furnished with long and deli- 
cate cilia, extending all round the wings. In some species, however, 
Mr. Haliday describes the fore-wings as transformed into broadish 
elytra, ciliated only behind, and with longitudinal and transverse nerves. 
In some species the wings are wanting, at least in the males; the ab- 
domen is terminated either by a long attenuated joint or by a 4-valved 
borer in the female; the legs are short, the anterior pair having the fe- 
mora sometimes much incrassated, with a tooth near the inner extremity 
(fig. 57.8.); the tibiz are simple, the tarsi 2-jointed, terminated by 
a vesicle + without ungues; the base of the anterior tarsi is, in some 
species, armed with a tooth, at least in the males; the middle (jig. 
57. 9.) and posterior pair of legs (fig. 57.10.) are simple. My figures, 
57. 1—12., are taken from the largest species of the order which I 
have seen, and of which I captured a considerable number, creeping 
under and upon the bark of felled trees, at Sévres, in July, 1837. It 
appears to be nearly allied to Phleothrips coriacea Hal. 
The eggs of Phleothrips statices Hal. “are shaped like those of 
Culex, being cylindric, rounded at one end, and crowned with a knob at 
the other.” The larva (jig. 57. 16., from De Geer) is equally active with 
the imago inhabiting the same situations, and differing in smaller size, 
softer body, distinct thoracic segments ; ‘ the mouth is almost alike, 
the antenne and legs shorter ; there are no simple eyes, and the com- 
* If regarded as Mandibulata (although they are certainly not Dacnostomatous), 
they will possess the greatest affinity with those Biomorphotic insects which have 
equal sized unfolded wings, and which will be found amongst the earlier families of 
Neuroptera, especially the Termitidz. 
+ De Geer observes, that, when the animal presses this vesicle on the surface upon 
which it walks, its diameter is increased, and it sometimes appears concave, the con- 
cavity being in proportion to the pressure, which made him suspect that it acted like 
a cupping-glass. 
B 2 
