[Fig. 1. 
Fig. 2. 
Fig, 3. 
Rr Baa 
IL 
m. 
DESCRIPTION OF THE PLATE, 
Agrilus ruficollis, Fab. a. Its natural length. ] 
Hessian fly, male. (Ceeidomyia destructor.) From 
a young specimen, having the fulvous sutures of 
the abdomen wide. 
Its natural size. 
Ventral view of the terminal segments of its abdomen. 
Joints of its antenna. tei 
Hessian fly, female. (C. destructor,f.) From an 
older specimen, having the fulvous sutures nar- 
row and in part obliterated. 
Joints of its antenna. 
Profile view of the head, palpi, and origin of the an- 
tenna. 
Dorsal view of the worm or active larva. 
do do __.‘* flax seed,” or larva case. 
Ventral view of the same. 
Lateral view of the same. 
Dorsal view of the dormant larva, taken from the 
larva case, 
Ventral view of the pupa. 
Wheat stalk; sheath broken away, showing the 
young worms on their way to the joint. 
nando. Wheat stalks ; sheath broken away, showing 
the “‘ flax seeds” in their ordinary situation. 
A. Appearance of a healthy (*), and of a diseased (+) shoot of 
wheat in autumn, the worms lying at §. 
B. Appearance of a healthy (**), and two diseased stalks of 
wheat at harvest time. (tt) Stalk broken, from 
being weakened by the worms. §§ Base of sheath 
ees from worms having laid under it, and 
perforated by parasites coming from those worms. 
ERRATA. 
Page 5, line 17, for ‘‘ Oseinis frit (Linn.) Lat., which infests 
the ears of barley” read ‘‘ Chlorops pumilionis 
(Bjerkander) Meig. living in the base of the 
stalks of wheat and rye.” 
10, line 24, for ‘‘ evidence” read “ credence.” 
21, line’ 32, for “ nor” read “ and.” 
32, line 36, for ‘' winged” read “ wrinkled.” 
61, line 20, for “ of ” read ** Of.” a 
62, line 16, for “the” read * a.” - 
line 26, for “sheaf” read “ sheath.” 
