THE FLY. 537 



lay eggs ; a circumflance that lliews the futility of our 

 attempts to arrange them. Some of the viviparous flies 

 poffefs a degree of fecundity that mull appear altogether 

 incredible to thofe who have not been verfant in the itudy 

 of infedls. Some of them have been found to contain in 

 their body no lefs than twenty thoufand living animals 

 at one time *. 



Mufca domejiica, the houle 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 oijitly f . 



Mufca "vefpa fimilis^ the wafp fly, entirely refembles 

 the animal whofe name it bears ; the head is lemon co- 

 loured ; the antennae 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 

 Mack, partially covered with a few brown hairs, and ha- 

 ving the point fometimes yellow : The abdomen has its 

 under part black, the upper white, and is tranfparent 

 both above and below :|:. 



* Reaumur, Tome IV. Mem, x. + HarrU's Inf. p. I4», 



f Earbut's Gca. Inf. p. 301. 



Vol. hi. ? Y 



