65 



THE HESSIAN FLY. 



Cecidomyia destructor Say. 



(Should be known as Mayetiola.) 



For general article with bibliography see Osborn, Bui. 16, n. s. 

 Div. Ent., U. S. Dept. Agric., 57 pp., 1898; Marlatt, Farmers' Bui. 

 132, U. S. Dept. Agric. pp. 13-22, 1901. 



Exhibit: Puparia, adult, work, figures, and map. 



THE GREATER WHEAT-STEM MAGGOT. 



Meromyza americana Fitch. 

 For general article see Webster, Bui 42, Div. Ent., U. S. Dept. 

 Agric, pp. 13-51, 1903. 



Exhibit: Adult, work and figure. 



THE AMERICAN FRIT-FLY. 



Oscinis soror Macq. 

 For general article see Webster, Bui. 12, Div. Ent., U. S. Dept. 

 Agric, pp. 57-62, 1903. 



Exhibit: Adult, work, and figure. 



THE LESSER WHEAT-STRAW MAGGOT. 



Oscinis carbonaria Loew. 

 For general article see Webster, Bui. 12, Div. Ent., U. S. Dept. 

 Agric, pp. 51-56, 1903. 

 Exhibit: Adult. 



CHLOROPS PROXIMA Say. 



For short account see Comstock, Rept. U. S. Comm. Agric, 1879, 

 pp. 257-258, 1880. 



Exhibit: Adult and work. 



INSECTS INJURIOUS TO HOPS. 



THE HOP PLANT-LOUSE. 



Phorodon humuli Schr. 



(Attacks hop and plum.) 



For full life history see Riley, Circ. 2, Div. Ent., U. S. Dept. Agric, 

 1891. 



Exhibit: Adult, work, and figures, with two enemies: Chrysopa sp. 

 and Adalia hipunctata Linn. 



THE COMMA BUTTERFLY. 



Polygonia comma Harr. 

 (Formerly Grapta.) 



For general account see Howard, Bui. 7, n. s., Div. Ent., U. S. 

 Dept. Agric, pp. 50-51, 1897. 

 Exhibit: Larva and adult. 



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