CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 245 



grey, usually banded with white; later color harmonizes with sur- 

 roundings. Full grown in 7 to 10 days. 



Pupa. — Like that of Culex but with shorter, more trumpet-shaped 

 breathing tubes; duration about 2 days. 



Other species of Anopheles are: A. pundipennis and A. crucians. 



The Salt Marsh Mosquito (^e(/e5.yo//fa7a«5Walk.), the Swamp Mos- 

 quito {A. syhestris Theo.) and the Irritating Mosquito (Mansonia per- 

 turbans Walk.) are commonly met with and are annoying. 



On the western prairies the genus Aedes is most abundant. The 

 eggs are laid in late summer and hatch out the following spring in the 

 water of the melting snow. There is but one brood a year. The most 

 common species are A. spcnccrl Theob., A. fletcheri Coq., and A. cur- 

 rlei Coq. 



CECIDOMYIIDiE (GALL MIDGES) 



Hessian Fly (Mayetiola destructor Say). — (Consult Ent. Bull. 11, 

 Dep. Ag., Ottawa; Bull. 116, Ont. Dep. Ag.; Cornell Bull. 194; and 



Fig. 155. — The hessian fly (Mayetiola destructor): i, adult female; 2, mature 

 larva; 3, puparium or " flax-seed "; 4, seed of flax. Enlarged about 8 times. (After 

 Criddle, Ent. Bui. 11, Dep. Agric. Can.) 



bulletins by Webster and Marlatt.) An introduced pest from Europe 

 and one of the most serious enemies of growing wheat. Distributed 

 over the wheat regions of United States and Canada. Attacks also 

 oats, barley, rye, Agropyron spp., Bromus, Elymus and Agrostis (Fig. 



155)- 



Adult. — A small dusky 2-winged fly, l<^ inch long, about half the 

 size of a common mosquito; the female with a dull reddish tinge and 

 larger than the male; legs long; wings smoky-black, covered with fine 

 black hairs and obscurely fringed. 



