302 INSECTA. 
DrymeEt, Meig. 
Where the proboscis presents the above character, and the eyes 
are contiguous posteriorly in the males(1). 
Sometimes the abdomen of these individuals is inflated at the end, 
and clavate. 
Cenosia, Meig.—Musca, De Geer. 
De Geer has given us the history of a species of this subgenus— 
Musca fungorum, Insect., VI, 89, v,2—7. Its larva lives in mush- 
rooms, and most commonly in those which are edible. He also 
observed that these larve devour each other, a rare cireumstance 
among Insects of this order(2). 
In the others, the antenne are shorter, and have a simple seta. 
The eyes are contiguous posteriorly in the males. The mouth 
is densely pilose. 
Erripuia, Meig.(3) 
Our third division, that of the Hypromyzipss, is characterized 
as follows: an almost triangular head with very prominent eyes; an 
inflated, convex snout or muzzle: a little arched lamina bordering 
the top of the buccal cavity, which is very large; a very thick pro- 
boscis, and the sides of the face destitute of sete. The antenne are 
inserted near the front, inclined, and very short, with the seta most 
commonly plumous. The wings are incumbent, one on the other. 
The legs are large, with the thighs, at least the anterior ones, infla- 
ted in several. 
All the species indigenous to France inhabit aquatic localities. 
In some, all the thighs, or at least the anterior ones are inflated; 
the seta of the antennz is always pilose(4). 
(1) Idem. 
(2) See Meigen. ; 
(3) Idem. 
(4) The wings also are somewhat different. 
