372 INSECTA. 



of those which occupy the middle of their leng-th — is closed before 

 the posterior edge. The proboscis is very thick, and the body is 

 depressed. 



These Diptera are almost always found in the vicinity of dung- 

 hills, which is most probably the abode of their larvae*. 



Sometimes the posterior legs scarcely differ from the others. 

 The antennae of several are almost as long as the face of the head, 

 and their seta is frequently pilose. The sides of the face are occa- 

 sionally glabrous. 



In some, the antennae are almost as long as the face, inclined, 

 generally approximated, and terminated by a narrow and elongated 

 palette, with the seta always pilose. The abdomen, at least that of 

 the male, is elongated, almost cylindrical, terminated by a club in 

 some, and a stilet in others. 



In these, the sides of the face are furnished with hairs or musta- 

 chios. 



Here, the abdomen presents externally but four segments. The 

 seta of the antennae is simple, 



DiALYTA, Meig.\ 

 There, it offers five rings at least. 



CoRnYLURA, Fall., Meig. — Ocyptera, Fab., 

 Where the wings extend but little, or not at all, beyond the ab- 

 domen, which terminates in a club in the malcs|. 



ScATOPHAGA, Lat., Meig. — Musca, Lin., Fab., 

 Where the wings are much longer, and the abdomen is not inflated 

 at the posterior extremity in either sex. 



S. ster cor aria ; Musca stercoraria, L. ; Reaum., Insect., IV. 

 xxviii. Densely pilose and of a greyish-yellow ; front russet ; a 

 brown point on the wings ; seta of the palette bearded. Very 

 common on faecal matters, those of man particularly, where the 

 female deposits her eggs, which are retained on the surface by 

 two appendages resembling little wings §. 

 These are destitute of mustachios. 

 The body is always long, narrow, cylindrical, and linear. 



LoxocERA, Lai., Fab., Meig., 



Where the antennae are much longer than the liead. The Loxocerae 

 resemble little Ichneumons||. 



Chyliza, Fall., Meig., 

 Where they are rather shorter than the head, with the seta thick, 

 and in the form of a stilet^. 



The antennas of the others are always much shorter than the head, 



* Lat., Ibid,, IV, 359; Wied., Anal. Entom,, under the name of Copromyza. 



f See Meigen. 



X Idem, 



§ Meig., and Lat., Gener., Crust, et Insect., IV, 358. 



II Lat., Fab., Meigen. 



«| Meigen. 



