THE FLIES: DIPTERA 



75 



the body parallel to the surface. In Anopheles the body and 

 beak are in the same plane no matter what the position 

 is; Culex is humpbacked, with the beak pointing down- 

 ward. These various distinctions are well shown in Fig. 

 50. The males of both genera can be distinguished from 

 the females by their larger and more feathery antennae. 



Fig. 51. Crane fly. (Enlarged) 



From the Illinois State Natural 

 History Survey 



Fig. 52. The Hessian fly 



a, adult; b, wheat plant suffering from 



attack of the fly ; c, larva. The small lines 



to the right of a and c indicate natural 



length. (After Berlese) l 



Many localities can be practically rid of these pests by 

 the drainage of the swamps or ponds in which they breed ; 

 by the use of kerosene or other oils on the surface of such 

 waters; or by the introduction of fish that feed on the 

 larvae. 



Minnows, goldfishes, sunfishes, and sticklebacks are all 

 mosquito destroyers. It must be remembered that the insect 

 will breed successfully in any transient pool of water, or in 



1 Reprinted by permission from Applied Entomology, by H. T. Fernald, pub- 

 lished by the McGraw-Hill Book Company, Inc. 



