DIPTERA. 



As their name implies, the Diptera possess only two wings. 

 These, again, cannot be folded, and the place of the lower pah- 

 is taken by two little winglets or balancers. The mouth is 

 formed for suction. Without going further into technical de- 

 tail, we will proceed to a short description of the insects which 

 have been selected as examples. 



Fig. 4S9.— Tipula imperator. 

 (Yellow and black.) 



Everyone is familiar with the group of flies called Tipulidse, 

 the various insects known by the popular title of " Daddy Long- 



