THE TLX. 
537 
lay eggs ; a circumftance that fliews the futility of otir 
attempts to arrange them. Some of the viviparous flies 
poflfefs a degree of fecundity that mu ft appear altogether 
incredible to thofe who have not been vetfant in the ltu'dy 
of infe<9ts. Some of them have been found to contain in 
their body no lefs than twenty thoufand living animals 
at one time *. 
Mufca domefiica , the houfe fly. The thorax of this 
fpecies is brown, having upon it four occult dark lines ; 
the abdomen is of an orange brown, with a few fpots of 
black. This fly feldom makes its appearance before the 
month o£ July f. 
Mufca vefpe /mills, the wafp fly, entirely refembles 
the animal wbofe name it bears ; the head is lemon co- 
loured ; the antennas are brown ; the thorax and abdo- 
men are black, the latter marked with tranfverfe bands of 
yellow. 
Mufca pellucens, the tranfparent fly. The thorax is 
black, partially covered with a few brown hairs, and ha- 
ving the point fometimes yellow : The abdomen has its 
tinder part black, the upper white, and is tranfparent 
both above and below J. 
* Reaumur, Tome TV. Mem. x. f Harris’* Tat p, 14%, 
\ Earbut’s Gen. Inf. p. 301. 
3Y 
Vol. III. 
