DIPTERA. 241 
than the head in both sexes, are generally thick, consist of from 
eight to twelve joints, in the form of a perfoliate club, nearly cylin- 
drical in most of them, fusiform in some, and terminated in others 
by a thicker and ovoid joint. The body is short and thick. The 
head of the males is almost entirely occupied by the eyes. These 
Insects approach the fungivorous Tipularie in the nervures of their 
wings and the palpi. Such particularly are those which form the 
a 
Corpyia, Meig. 
Removed from all the following ones by their fusiform antenne 
composed of twelve joints. The eyes are round, entire, distant, and 
the ocelli are wanting. Their legs are long, and their tibize spinous 
at the extremity(1). 
We will now pass to subgenera in which the antenne are com- 
posed of eleven joints, forming an almost cylindrical club. The 
eyes of the males are always very large and approximated or con- 
tiguous. 
Here, as in the preceding subgenus, the head is destitute of ocellis 
the eyes of the females are emarginated on the inner side in the form 
of a crescent. 
Simvutium, Lat. Meig.—Culex, Lin.—Rhagio, Fab. 
Where the antenne are somewhat hooked at the end, and hence 
the name of fractocera first given to this subgenus by Meigen. 
They are very small Insects, frequent low, wet woods, and annoy us 
by the severity of their bite. They sometimes penetrate into the — 
genital organs of cattle and killthem. They, as well as-the Culices, 
have been called Musquetoes(2). 
There, the three ocelli are distinct. 
One single subgenus approaches Simulium in the lunated eyes of 
the females, and is distinguished from all others of this division by 
its very small palpi that present but one distinct joint. It is the 
ScatuoprseE, Geoff. Meig. Illig. 
One species of this subgenus, the 
(1) Meig., Dipt., I, 274. 
(2) Lat., Ibid.; Meig., and Fab. 
Vout. 1V.—2 F 
