DIPTERA OF MINNESOTA. 



143 



and from the army worm. S. incerta. Walker, has been bred from 

 cow dung; S. quadrisetosa, Coq., breeds in the excrement of man and 

 cattle ; S. sorracciiia, Riley, a very common species in Minnesota, has 

 been reared from human excrement as well as from "grasshoppers." 



Enough species have been cited to give an idea of the habits of the 

 family, useful in many things, but a menace in others. How people 

 can tolerate in their dwellings the presence of house flies and others 

 which are found with them, after knowing their habits, is beyond the 

 comprehension of an entomologist. 



We list the following species from Minnesota : Sarcophaga hclicis, 

 Town., parasitic on M. atlanis; S. sarracenia, Riley; S. sp. 



MUSCIDAE, 



(/// Strictest Sense.) 

 House flies. Bine Bottles. Horn Flies, Stable Plies, etc. 



I'ig. 137. House Fly. Lugger. 



Equalling, if not exceeding in importance any other family, on 



