LEPIDOPTERA. 219 
almost naked and turned up. The chrysalis is enclosed in a cocoon 
of silk. Latreille distinguishes these species by the generic appel- 
lation of OrnropeEs(1). 
ORDER XI. 
RHIPIPTERA. 
This order was established by M. Kirby under the name 
of Stresiptera (twisted wings), on certain Insects remarkable 
for their anomalous 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, movable bodies, in the form of 
little elytra, directed backwards, that are narrow, elongated, 
clavate, curved at the extremity, and terminate at the origin 
of the wings(2). As elytra, properly so called, 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 (pferygoda) we have 
already observed at the base of the wings in the Lepidoptera. 
The wings of the Rhipiptera are large, membranous, divided 
by longitudinal and radiating nervures, and fold longitudi- 
nally in the manner of a fan. The mouth consists of four 
pieces, two of which, the shortest, appear to be so many biar- 
(1) P. hexadactylus, Fab.; the Ptérophore en éventail of Geoffroy. See Lat., 
Gen. Crust. et Insect., IV, p. 234 and 235. 
[See also for American species generally, Bois-Duval and Le Conte, op, cit. 
Am. Ed.) 
(2) The prebalanciers, Lat. 
