DIPTERA. 299 
leaves its eggs there. When the larva is about to become a 
pupa, it abandons the putrescent matters in which it has lived, 
which might then prove injurious to it, and penetrates, if pos- 
sible, into the earth, or is metamorphosed in some dry and re- 
tired spot. 
M. cesar, L. Body, a glossy golden-green; legs black. The 
female deposits her eggs on carrion. 
- M. domestica, L.; De Geer, Insect., VI, iv, 1—11. The tho- 
rax of the Common Fly is of a cinereous-grey with four black 
streaks; abdomen blackish-brown spotted with black, and yel- 
lowish-brown above. The five last abdominal annuli of the fe- 
male form a long and fleshy tube which she introduces, in 
coitu, into a slit situated between the pieces furnished with 
hooks, that terminate the abdomen of the male, and characterize 
his sex. The larva lives in warm and moist dung(1). f 
Sarcopnaca, Meig.—Musca, Lin. Fab. 
Only differing from Musca proper by the eyés being remarkably 
distant in both sexes. The ova are sometimes hatched in the venter 
of the mother—these species are called viviparous. 
S. carnaria; Musca carnaria, L.; Mouche vivipare, De Geer, 
Insect., VI, iii, 3—18. Rather larger and more elongated than 
the vomiforia; body cinereous; eyes reds streaks on the thorax 
and square spots on the abdomen, black. 
The female is viviparous and deposits her larve, which fill 
the cavity of her abdomen, on meat, carrion, and sometimes in 
wounds in the human body. By strongly pressing the abdomen 
of the male, a bowel-like body of a transparent white may be 
made to protrude, which has a vermicular motion that is conti- 
nued even after the Insect has been cut in two(2). 
We will terminate the Creophila with genera which form a con- 
trast with the preceding ones, either in certain peculiarities of the 
head, or by the situation of the wings, or the cells of their posterior 
extremity. 
The seta of the antennz is pilose in most of them. 
In some, such as the two following subgenera, the wings termi- 
(1) See Meigen: certain species that are more hairy form his genus Mesembrina. 
(2) See Meigen. 
