198 



DIPTERA OR TRUE FLIES. 



however, but is an undoubted native species. The damage 

 caused by this midge is very severe in the American continent; 



B. 



Fin. 93. — TjArva and Pupa op Flies. 

 A, Larva, and B, pupa of a Cecidomjiin (greatly enlarged). 



but over here it only now and then makes itself sufficiently 

 noxious to call for special attention. The adult fly is a small 

 hairy creature, brownish in colour, with 

 pinkish markings on the abdomen in 

 the female, much darker in the male. 

 It belongs to the genus Cecidomyia, 

 which can be told by the venation of 

 the wings shown in figure 95. The 

 small reddish-white cylindrical eggs are 

 laid by the female in rows on the leaf 

 of the young wheat-plants in jMay ; the 

 small white maggots crawl down tlie leaf, and bury themselves 

 in the leaf-sheath, generally taking up their position above the 



Fia. 94. — Anchor Processes. 

 1, Anchor process of Hessian 

 fly ; 2, of Wheat midge. (Or- 

 merod.) 



