296 INSECTA. 
des Sc. Nat., X, 248, 11—M. Leon Dufour has described the larve 
of two species; the O. casside and the O. bicolor. That of the first 
species lives in the visceral cavity of the Cassida bicolor, and that of 
the second in the same situation in the Pentatoma grisea. Both of 
them feed exclusively on the epiploon or corps graisseux of their 
hosts. Their body is oblong, soft, whitish, perfectly glabrous, ru- 
gose and contractile. 
Its anterior extremity presents two mammille, each furnished with 
two little cylindrical bodies terminated in the manner of a button 
umbilicated in the centre, and with as many strong, horny pieces, 
each provided exteriorly with one or two large hooks, which gives 
them the appearance of being forked, and their convex sides placed 
back to back. From the figure given by this naturalist, it would 
seem that there is one for each mammilla, and that they are internal. 
He considers them as mandibles, and the species of palpi, of 
which we have just spoken, the disk of which is perforated in the 
centre, as a sort of foot-palpi, acting like a cup or organs of touch. 
The body of these larve terminates by a sort of siphon, about one 
third as long as the body, of a more solid consistence and constant 
form that becomes gradually narrowed, and with the appearance of 
two hooks at the end. The posterior extremity of this siphon oc- 
cupying one of the metathoracic stigmata, and being in contact with 
the air, enables the larva to respire. Neither antenne nor eyes can 
be perceived. It isin this same abode that the larva passes into 
the state of a pupa. The latter is ovoid, exhibits no trace of annuli, 
and presents at one extremity four (O. casside) or six (O. bicolor) 
tubercles. It leaves its domicil previously to attaining its perfect 
condition, sometimes while the Insect in which the larva resided is 
still living, and sometimes at the expense of its life. These larve 
have two salivary vessels, four biliary vessels, and tubular trachex 
without a nacred aspect, or transverse striz, arranged in two prin- 
cipal trunks, and giving off numerous ramifying branches. These 
trunks appear to empty into a unique orifice at the base of the cau- 
dal siphon. The alimentary canal is about four times the length 
of the body, and presents a capillary esophagus, a crop resembling 
a turbinated bowl of a pipe, which insensibly degenerates into a 
tubular, doubled stomach, followed by a flexuous intestine, a slightly 
apparent rectum, and terminated by an oblong cecum(1). 
(1) Idem., and the Encyc. Méthod., article Ocyplere. 
