DIPTERA. 367 
which they divide their aliment, and accelerate its decomposition. 
The metamorphosis of these Insects is effected in a few days. The 
posterior extremity of the abdomen of the females is narrowed and 
prolonged in the manner of a tube or ovipositor, by which she can 
insert her eggs. 
M. vomitoria, L.; Rees., Insect., II, Musc., et Cul., ix, x 
A large species ; fr ont fulvous ; thorax black ; abdomen ager 
blue with black streaks. 
This Insect enjoys the sense of smell to a high degree, an- 
nounces its presence in our dwellings by a loud humming, and 
deposits its ova on meat. Deceived by the cadaverous odour 
arising from the Arum dracunculus, L., when in flower, it also 
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 *. 
Sarcopusca, Meig.—Musca, Lin. Fab., 
Only differing from Musca proper by the eyes being remarkably dis- 
tant 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 vomitoria; body cinereous; eyes red; 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 twof. 
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 ex- 
tremity. 
The seta of the antenne is pilose in most of them. 
* See Meigen: certain species that are more hairy form his genus M/esembrina. 
+ See Meigen. 
