DIPTERA. 325 
posterior margin. The nervure in the middle, which traverses them 
longitudinally, bifurcates near the centre of their disk, and forms a 
complete or closed oval cell. With the exception of their tibize, these 
Diptera are closely allied to the Leixe *. 
There the eyes are evidently emarginated on the inner side. 
Mycerrosia, Mezq., 
Where the antennz consist of sixteen joints, and the wings present 
a large closed cell, extending from the base to the middle +. 
Motozrus, Lat.—Sciara, Meiq. Macq., 
With similar antennz, and where the middle of the wing presents a 
cell extending from the base to the posterior margin, and only closed 
by the latter t. 
Camprytomyza, Weig. Mezq., 
Where the antennz consists of but fourteen joints, at least in the 
females, and also distinguished from the preceding by the wings, 
which are hairy and destitute of nervures at their internal margin. 
The eyes are entire §. 
Our last Tipulariz are fungivorous. 
Crropiateus, Bose. Fab., 
Where the palpi are turned up, appear to consist of but one joint, and 
aie ovoid; the antennz are fusiform and compressed ||. 
Our last general division of the Tipularic, that which I call the 
Floralzs,is composed of species in which the antenne, hardly longer 
than the nead in both sexes, are generally thick, consist of from 
eight to iwelve joints, in the form of a perfoliate club, nearly cylin- 
drical in most of them, fusiform in some, and terminated in others by 
athicker 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 Tipulariz in the nervures of their wings 
and the palpi. Such particularly are those which form the 
Corvyta, Meigq., 
Removed from all the following ones by their fusiform antennz 
composed of twelve joints. Their eyes are round, entire, distant, and 
“the ocelli are wanting. ‘Their legs are long, and their tibiz spinous 
at the extremity {. 
We will now pass to subgenera in which the antenne are com- 
posed of eleven joints, forming an almost cylindrical club. The 
* Meig., Dipt.1I, 155. 
+ Meig., and Macq. 
t Meig., and Macq. The only difference between this and the preceding subgenus 
appears to me to consist in the wings, and these characters are so slightly defined 
that the two subgenera might be united. Olivier, in one of his first Memoirs on 
certain Insects which attack the cerealia, has described three species of Sciarze and 
figured two. 
§ See Meigen. 
i| See Lat., Gen. Crust. Insect., IV, 262. See also Fab., Meig., genus Platyura, 
Macq., and Dalm., Anal. Entom., 98. 
¥ Meig. Dipt.,, 1, 274. 
