370 INSECTA. 
In some, all the thighs, or at least the anterior ones, are inflated ; 
the seta of the antennz is always pilose *. 
RopaLomMerRA, Wied., 
Where all the thighs are inflated, and the face presents a prominence 
or tubercle anteriorly +. 
Ocutera, Lat.—Musca, De Geer. —Tepuritis, Fab.—Macrocuira, 
Meiq., 
Where the two anterior thighs are very large, compressed, and den- 
tated beneath, and the tibie are arcuated, capable of being flexed on 
the inferior edge of the thighs, and terminated by a strong spine f. 
The thighs of the other Hydromyzides are not inflated. 
Epuypra, Fall. 
The Ephydre resemble the Ochterz in the prominence of their 
eyes, which project posteriorly beyond the head, and in their thick 
snout; but the seta of their antenne is simple, and merely thickened 
inferiorly; the palette is rounded atthe end. There is a little tuber- 
cle or prominence on the posterior part of the vertex §. 
Nortipuiva, Fall., 
Where the head is more rounded, and without any anterior prolon- 
gatign in the form of a snout; the eyes are less protuberant, and do 
not project beyond the posterior margin of the head. The seta of 
the antenne is plumous; the palette is proportionally more elongated 
than in Ephydra and less rounded; no tubercle or prominence on 
the vertex. 
We have followed the system of M. Fallen in placing this subge- 
nus here, although we think it would be more proper to arrange it 
in the ensuing division, near the Heleomyze, from which it searcely 
differs. The 
N. cellaria, Panz., Faun. Insect., Germ., XVII, 24, which 
deposits its eggs in vessels containing vinous liquors, belongs to 
this subgenus. We formerly referred it to Mosillus |]. 
The Muscides of the three following divisions have an oblong 
body; the wings are incumbent and non-vibratile; the head, either 
rounded or almost spherical, or nearly pyramidal, or bordering on 
an oval, is plane above, prolonged and narrowed into a point, usually 
truncated or obtuse at its anterior superior extremity; and the face 
is covered with a white membrane, furrowed longitudinally on each 
side. ‘he head is frequently compressed below the antenne, and its 
inferior or oral extremity projects in the manner of a truncated snout; 
in others, the face forms a strongly inclined plane, which is not (or 
* The wings also are somewhat different. 
+ Wied., Anal. Entom. 
t Lat., Gener., Crust. et Insect., IV, 347. 
§ Fall., Dipt., and Wied., Ibid. 
\| It may perhaps be a Piophyla, Fall., a genus in which is placed the M. casei, L., 
whose body is very black and glossy; epistoma, front and legs, fulvous; anterior legs 
and posterior thighs with a black ring. 
