62 



FIRST KEPORT ON ECONOMIC K1OLUGY. 



edge of the opening of the egg, and so when the slightest friction is 

 brought to bear upon the ripe egg it is easily torn off. 



When newly deposited, what I have termed the attachment 

 surface and the inside of the two lateral extentions are covered with a 



Fig- 32- 



Fig. 31. 



Fig. 30. 



THE HORSE Box FLY. 



FIG. 30. Egg of Gastrophilus equi (Fabr.), attached to hair by lip-like valves. 

 FIG. 31. The same seen from under side, showing attachment surface. 

 FIG. 32. Operculum, seen from above. 



