119 
EXPLANATION OF PLATES * 
Plate I. 
Fig. 1. The Root Web Worm, Crambus zeellus ; 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; b, gnawed surface of stalk; c, tip of seveied 
leaf drawn into mouth of nest. (Original.) 
Fio-. 4. The Sulphur Leaf Roller, Dichelia sulphureana; magnified 
two and tlireefourths diameters. (Original.) 
Ficr. 5. The Wheat Straw Worm, Isosoma tritici : a, larva, ventral 
view; b, do., lateral view; c, antenna; d, mandibles, t, 
anal end, ventrally; /, imago; g, h, front and hmd wings 
of exceptional individuals; i, aborted wing m the noimal 
flies,—all relatively enlarged. (After Riley.) 
Fig. 6. Parasite of the Wheat Straw Worm, Eupelmus 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 vellow; the stem swollen at three places, near the 
ground where the flaxseeds (li) 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 h ); b, the larva, enlarged, the m 
bv the side, m this and other figures, showing the natural 
length; c, the flaxseed, pupanum, or pupa case; d, the 
pupa or chrysalis; e, the Hessian Fly natural size, laying 
itseggs in the creases of the leaf; /, female Hessian Fly 
much enlarged; g, male Hessian Fly mueh en arged ^ 
flaxseed between the leaves and stalk; i, Chalcid oi ich 
neumon parasite of the Hessian Fly, male, enlarged. 
(From 10th Report,) 
*The drawings for the original eutsonthe foilowingpla^es ^('Ijgf^PlateXLh which 
larman, with the exception of Fig. 3, Plate 1,1? ig. 4, ciate a±, auu x s 
?ere drawn by Mr. H. Garman. 
