370 INSECTA. 



In some, all the thighs, or at least the anterior ones, are inflated ; 

 the seta of the antennae is always pilose *. 



RoPALOMERA, Wied., 

 Where all the thighs are inflated, and the face presents a prominence 

 or tubercle anteriorly f- 



OcHTERA, La^. — MuscA, De Geer. — Tephritis, Fab. — Macrochira, 



Meig., 

 Where the two anterior thighs are very large, compressed, and den- 

 tated beneath, and the tibise are arcuated, capable of being flexed on 

 the inferior edge of the thighs, and terminated by a strong spine |. 

 The thighs of the other Hydromyzides are not inflated, 



Ephydra, Fall. 

 The Ephydrse resemble the Ochterae in the prominence of their 

 eyes, which project posteriorly beyond the head, and in their thick 

 snout; but the seta of their antennae is simple, and merely thickened 

 inferiorly; the palette is rounded at the end. There is a little tuber- 

 cle or prominence on the posterior part of the vertex §. 



Notiphila, Fall., 

 Where the head is more rounded, and without any anterior prolon- 

 gation 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 antennae 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 Heleomyzae, from which it scarcely 

 diff'ers. The 



A', 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. The head is frequently compressed below the antennse, 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. 



t Wied., Anal. Entom. 



X Lat., Gener., Crust, et Insect., IV. 347. 



§ Fall., Dipt., and Wied., Ibid. 



II 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. 



