THE COW-DUNa FLIES. 



633 



junction of the legs with the body, or, if the creature be lying on 

 the ground, upon the surface of the body that is next to the earth. 

 This is not the only Fly that deposits its young in this 

 curious manner, but I have selected the best known species as 

 an example of the group. 



On Woodcut LXXV., at Figs. 2 and 3, are shown two 

 species of the well-known Dung-Flies, of which the common 



l:xx\: 



1. Musca domestica. 2. Scatophaga scybalaria. 



a. Scatophaga scybalaria, antenna. 



3. Scatophaga stercoraria. 

 b. Do., tongue. 



Cow-DTTXG Fly {Scatophaga stercoraria) is the most plentiful. 

 In this genus the last joint of the antenna is rather long, the 

 head is spherical, and the body covered with stiff hairs. These 

 Flies may always be found in fields frequented by cows, as it is 

 upon the dung of these animals that the larvas are fed. 



The most remarkable point in the economy of these insects 

 is the development of the eg^. It is necessary for the due 



