194 NATURAL HISTORY. 



place their eggs in manure and all other decaying sub- 

 stances. 



The Blue Bottle (musca vomitoria) or Blue-flesh Fly. 

 is about half an inch long, hairy, black : abdomen shin- 

 ing blue, banded with black. The sense of smelling is 

 uncommonly fine ; discovering the presence of flesh from 

 a great distance, they are at once attracted, and deposit 

 their eggs upon it. Resembling it is 



The Corpse Fly ; the head is brilliant yellow, and 

 frequently is found hovering around the corpses of human 

 beings. 



The Gold Fly (musca csesar) is slender, three lines 

 long, smooth and shining green, with gold reflections. 

 They lay their eggs in putrid carcasses, flayed skins, 

 etc. Are found in the open air, rather than houses. 



The Gray Meat Fly (musca carnaria) is remarkable 

 in bringing forth its young living, and at once fitted for 

 preying on meat, that in consequence almost immediately 

 afterwards becomes putrid. There are several relative 

 species, as the Vinegar Fly, Mushroom or Puff-ball 

 Fly, etc. 



