40 
THE HESSIAN ELY IN THE UNITED STATES. 
sian fly, and that these bred insects were successfully distributed to fields infested 
by the fly at two places m Illinois — in Champaign and Scott counties, respectively. 
It should be said, in conclusion, that the latter part of the summer was exceed- 
ingly dry throughout central Illinois, and that as a consequence but little volunteer 
grain grew in either of the above localities, and that neither in this nor in the early 
sown wheat was there any considerable amount of Hessian-fly attack — circumstances 
which are to some extent unfavorable to rapid success of the experiment for the intro- 
duction of this parasite. The Vantyle farm was visited by my assistant, Mr. Marten, 
September 24. at which time the plowed portion of the field was being drilled to 
wheat. Along the margins of this plowed ground, near the plot which had been left 
in stubble, was a scanty growth of volunteer wheat, in which, after considerable 
search, four nearly full-grown larvaj of the Hessian fly and one fresh puparium were 
found. Little other volunteer wheat was seen in the neighborhood. A brief search 
of the stubble remaining showed only parasitized puparia from which parasites had 
already escaped. 
The Champaign County plot was examined September 30, when one hundred and 
Fig. 
-Entedon ejAgonns (from Howard, in Insect Life). 
twenty plants of volunteer wheat grown in the experimental stubble field were over- 
hauled. In these plants two larvae and seven puparia of the Hessian fly were found. 
October 5, from forty-three plants eight puparia and two nearly full-grown larvae 
were taken. As the period of the emergence of the imported Semiotellus was substan- 
tially the same as that of the native 8. destructor, the two coming out side by side in 
our breeding cages, it seems practically certain that the imported parasite must 
have had as fair a chance for propagation in the field as its native congener. 
We will of course keep careful watch of these localities next year, and will notify 
you of any observations then made bearing on the reappearance and the spread of 
this imported enemy of the Hessian fly. 
The results of the introduction in the vicinity of Washington are 
recorded by Dr. Howard in Insect Life, Vol. VII, page 414, as follows: 
In the last number of Insect Life (p. 356) we published a figure of Entedon epi- 
gonus (fig. 8), the principal European parasite of the Hessian fly, and mentioned 
the attempts which Professor Riley had made in 1891 to introduce the species into 
the wheat fields of this country. One of the last acts performed by Professor Riley 
before leaving this office in May, 1894, was to send a batch of parasitized puparia of 
