DIPTERA. 369 
A second general division of the Muscides, that of the AnrHomy- 
ZIDES, is composed of species resembling common Flies, in which the 
wings are most frequently incumbent and do not vibrate, and where 
the antenne are inserted near the front, are always shorter than the 
head, termimated by a linear palette or one forming a long square,. 
longer than the preceding joint, and with the seta most commonly 
plumous. The head is hemispherical, furnished with hairs anteriorly, 
and the eyes are closely approximated or contiguous posteriorly in the 
males. The legs are of an ordinary size, and the abdomen is com- 
posed exteriorly of four annuli. 
In some, the antenne are almost as long as the face of the head, 
and the seta is plumous. 
Sometimes the abdomen of both sexes is gradually narrowed, and 
terminates in a point. 
AntuomiA Metg.—Musca, Lin., Fab., 
Where the eyes are separated in both sexes; the proboscis does not 
terminate inthe manner of a hook, or by an abrupt and very open 
angle. 
A. pluvialis; Musca pluvialis, L., Cinereous, with black spots 
on the thorax, and nine triangular ones of the same colour on 
the abdomen. Very common in France *. 
. cs) 
Drymeia, Meig., 
Where the proboscis presents the above character, and the eyes are 
contiguous posteriorly in the males f. 
Sometimes the abdomen of these individuals is inflated at the end, 
and clavate. 
Caenosia, 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 ob- 
served that these larvze devour each other, a rare circumstance among 
Insects of this order f. 
In the others, the antennz are shorter, and have a simple seta. 
The eyes are contiguous posteriorly in the males. The mouth is 
densely pilose. 
Eripura, Mergq.§ 
Our third division, that of the Hypromyzings, is characterized as 
follows : an almost triangular head with very prominent eyes; an in- 
flated convex snout or muzzle: alittle arched lamina bordering the 
top of the buccal cavity, which is very large; a very thick proboscis, 
and the sides of the face destitute of setee. 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, inflated in 
several. 
All the species indigenous to France inhabit aquatic localities. 
* See Meigen. t See Meigen. 
+ Idem. § Idem. 
