DIPTERA. 363 
Ina “ Mémoire pour servir a l’Histoire du genre Ocyptera,”’— 
Ann. des Sc. Nat., X, 248, 1L—M. Leon Dufour has described the 
larvee 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, 
rugose 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. Frum the figure given by this naturalist, it would 
seem that there is one for each mammille, 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 occupying 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 is in this same abode that the larvee passes into the state of a pupa. 
The latter is ovoid, exhibits no trace of annuli, and presents at one 
extremity four (O. cassid@) or six (QO. bicolor) tubercles. It 
leaves its domicil previously to attaining its perfect condition, some- 
times while the Insect in which the larva resided is still living, and 
sometimes at the expense of its life. ‘These larvee have two salivary 
vessels, four biliary vessels, and tubular tracheze without a nacred 
aspect, or transverse strie, arranged in two principal trunks, and 
giving off numerous ramifying branches. These trunks appear to 
empty into a unique orifice at the base of the caudal 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 czecum *. 
In the following subgenus, or 
MetanopuHora, Meiq., 
Which he suppresses and unites to T’achina, the antennze are much 
shorter, their extremity, when they are inclined, scarcely extending 
beyond half the length of the face of the head. The most exterior of 
the two complete cells, which terminate the wing, is much more pro- 
longed posteriorly than the other, and the internal angle of its extre- 
mity is obtuse f. 
* See Meigen, and the Encyc. Méthod., artirle Ocypiére. 
+ Lat., Gener., Crust. et Insect., IV, 346. 
