310 _ INSECTA, 
almost naked and turned up. The chryalis is enclosed in a cocoon 
of silk. Latreille distinguishes these species by the generic appel- 
lation of OrNEoDEs *., 
ORDER XI. 
—— 
RHIPIPTERA. 
This order was established by M. Kirby under the name of Slreszp- 
tera (twisted wings), on certain Insects remarkable for their anoma- 
lous form and irregular habits. 
From the two sides of the anterior extremity of the trunk, near 
the neck and the exterior base of the two first legs, are inserted two 
small, crustaceous, moveable bodies, in the form of little elytra, directed 
backwards, that are narrow, elongated, clavate, curved at the ex- 
tremity, and terminate at the origin of the wings}. As elytra, 
properly so call, always cover the whole or the base of the latter 
organs and arise from the second segment of the trunk, these bodies 
are not true wing-cases, but parts analogous to those (pterygoda ) 
we have already observed at the base of the wings in Lepidoptera. 
The wings of the Rhipiztera are large, menbranous, divided by 
longitudinal and radiating nervures, and fold longitudinally in the 
manner of afan. The mouth consists of four pieces, two of whieh, 
the shortest, appear to be so many biarticulated palpi; the others 
inserted near the internal base of the preceding ones, resemble little 
linear lamin, which are pointed and crossed at their extremity like 
the mandibles of various Insects; they bear a greater similitude to 
the lancets of the sucker of the Diptera than to true mandibles f. 
The head is also furnished with two hemispherical, slightly pedi- 
culated, and granular eyes; two almost filiform and short antenne, 
approximated at base ona common elevation, consisting of three joints, 
the two first of which are very short, and the third very long, and 
divided down to its origin into two long, compressed, lanceolate 
branches, laid one against the other. The ocelliare wanting. The 
form and divisions of the trunk are very similar to those of several 
Cicadarize Psyllee, and chrysides. The abdomen is almost cylindrical, 
consists of eight or nine segments, and is terminated by pieces also 
*®P. hexadactylus, Fab.; the Ptérophore en éventail of Geoffroy. See Lat., Gen. 
Crust. et Insect., IV, p. 234 and 235. 
+ The prebalanciers, Lat. 
t According to Savigny, their mouth consists of a labrum, two mandibles two 
maxillz, each bearing a very small uniarticulated palpus and ofa labium without palpi. 
Se ee 
