DESCRIPTION OF THE PLATE. 
Fig. 1. Agrilus rvficoUis, Fab. a. Its natural length. 
Fig. 2. Hessian fly, male. (Cecidomyia destructor.) From a young specimen, hav¬ 
ing the fulvous sutures of the abdomen wide. 
b. Its natural size. 
c. Ventral view of the terminal segments of its abdomen. 
d. Joints of its antenna. 
Fig. 3. Hessian fly, female. (C. destructor, °.) From an older specimen, having 
the fulvous sutures narrow and in part obliterated. 
e. Joints of its antenna. 
/. Profile view of the head, palpi, and origin of the antenna. 
g. Dorsal view of the worm or active larva. 
h. do do “ flax seed,” or larva case. 
i. Ventral view of the same. 
j. Lateral view of the same. 
k. Dorsal view of the dormant larva, taken from the larva case. 
l. Ventral view of the pupa. 
m. Wheat stalk; sheath broken away, showing the young worms on their 
way to the joint. 
». ando. Wheat stalks; sheath broken away, showing the “flaxseeds” in their 
ordinary situation. 
A. Appearance of a healthy (•), and of a diseased (f) shoot of wheat in autumn, 
the worms lying at §. 
B. Appearance of a healthy (•*),and two diseased stalks of wheat at harvest time. 
(jj) Stalk broken, from being weakened by the worms. §§ Base of sheath 
swollen from worms having laid under it, and perforated by parasites 
coming from those worms. 
