DIPTERA. 379 
fectly sound and ripe lemons, on account of the abundance of 
a dipterous Insect of the same genus, which deposits its eggs in 
them*. 
Sometimes the head is most compressed transversely, so that its 
superior plane is more inclined than in the preceding species, and the 
antenne, when viewed in profile, appear to be inserted near the 
middle of the face. The proboscis is very thick and partly salient. 
The wings are separated horizontally, and the abdomen presents 
exteriorly but four segments. 
Piatystoma, Meig.—Dicrya, Fab.} 
This last subgenus manifestly leads us to the Timie of Wiede- 
mann, closely approximating itself to our Mosillus and Lauwania, and 
to some other subgenera of M. Meigen. 
They will close our eight division, that of the GymNnomyzivEs. 
These Muscides are small, with a short, thick, arcuated and almost 
glabrous body of a glossy-black colour. Their head is strongly com- 
pressed transversely, like that of the Platystome, is of a uniform 
colour, generally that of the body, without any projection inferiorly, 
and with a large oval aperture. The wings are incumbent on the 
body, and extend beyond it posteriorly; the scutellum projects; the 
abdomen is depressed, short, and terminated in some by a little point 
in the form of a stilet; the legs are almost glabrous or but scarcely 
pilose. 
In some, the attennz are almost as long as the head, and distant. 
Crxtyranus, Dalm. 
Easily distinguished from all other Diptera by the scutellum, which 
covers the whole back of the abdomen, as in Scutellera. 
C. obtectus, Dalm., Anal. Entom. The only species known. 
From Java. 
Lauxania, Lat., Fab., Meigq., 
Where the scutellum is of an ordinary size, and the antenne have a 
plumous seta f. 
The others have attenne shorter than the head. 
Here, they are always very short, inserted beneath a sort of arch 
that traverses the face, and very distant; the first cell of the posterior 
edge of the wings, or that which directly follows the cubital, is most 
frequently closed. The antenne are lodged in fossulz, and the space 
between them is elevated. The front is frequently punctured. 
Those species, in which the first cell of the posterior edge is almost 
closed, form, in the system of Meigen, two genera. His Timi 
( Timia ), in which, according to him, the abdomen exhibits six an- 
nuli, and the palette of the antenne is ‘short and almost semi- ovoid ; 
and his Ulidie ( Uldia ), where it is more elongated, almost ellipti- 
cal, and where the abdomen presents but five rings. M. Fallen had 
* See Meigen. 
+ Idem. 
t Lat. Gener. Crust. et Insect., 1V, 357; Fab. Rand Meigen. The latter unites 
Bone species with it, in which the attenne are shorter, that might form a separate 
subgenus. 
cc? 
