119 



EXPLANATION OF PLATES.* 



Plate I. 



Fig. 1. The Pioot Web Worm, Crainhus zeclltis ; magnified one and 

 a half diameters. (Original.) 



Fig. 2. Imago of same ; magnified two diameters. (Original.) 



Fig. 3. Corn plant injured by Root Web Worm : a, tubular nest in 

 the earth ; h, gnawed surface of stalk ; c, tip of severed 

 leaf drawn into mouth of nest. (Original.) 



Fig. 4. The Sulphur Leaf Roller, Dichelia sidphureana ; magnified 

 two and threefourths diameters. (Original.) 



Fig. 5. The Wheat Straw Worm, Isosoma tritlci : a, larva, ventral 

 view; h, do., lateral view; c, antenna; d, mandibles; c, 

 anal end, ventrally; /, imago; g, h, front and hind wings 

 of exceptional individuals ; i, aborted wing in the normal 

 flies, — all relatively enlarged. (After Riley.) 



Fig. 6. Parasite of the Wheat Straw Worm, Eiqjeluius allyni; mag- 

 nified nine diameters. (Original.) 



Plate II. 



The Hessian Fly, Cecidomyia destructor, and its transformations. 

 A healthy stalk of wheat on the left, the one on the right 

 dwarfed and the lower leaves beginning to wither and 

 turn yellow ; the stem swollen at three places, near the 

 ground where the flaxseeds (h) are situated, between the 

 stem and sheathing base of the leaf. 



a. Egg of the Hessian fly (greatly enlarged, as are all the 

 figures except e and li) ; h, the larva, enlarged, the line 

 by the side, m this and other figures, showing the natural 

 length ; c, the flaxseed, puparium, or pupa case ; d, the 

 pupa or chrysalis ; e, the Hessian Fly, natural size, laying 

 its eggs in the creases of the leaf ; /, female Hessian Fly 

 much enlarged ; g, male Hessian Fly much enlarged ; h, 

 flaxseed between the leaves and stalk ; i, Chalcid or Ich- 

 neumon parasite of the Hessian Fly, male, enlarged. 

 (From 10th Report,) 



*The drawings for the original cuts on the following plates were made by Mrs. Rosalie 

 Garman, with the exception of Fig. 3, Plate I. Fig. 4, Plate XI, and Fig. 4, Plate XII, which 

 were drawn by Mr. H. Garman. 



