34 
THE HESSIAN FLY IN THE UNITED STATES. 
Eupelmus allynii French. (Fig. 1.) 
Professor French, who was the first to describe this species, at first 
believed it to be a wheat pest, but subsequent study and the observa- 
tions of Drs. Riley and Forbes have established it as a parasite of the 
Hessian fly, with a number of other forms. 
The fact that it lives on other iusects is a point in its favor, as this 
enables it to survive during years when the Hessian iiy is wanting or 
very scarce. 
Professor French's description is as follows: 
Male. — In this sex the body, wings, and antennae are colored like the females, 
but the antenna' arc a little more slender at their ends. The head and thorax 
Fig. l.—Eupeluois allynii, male (after Riley). 
FIG. 5. — Eupelmu: allynii, female (from Riley). 
have about the same measurements, but the abdomen is a little shorter, the whole 
insect being from 0.06 to 0.07 of an inch. The legs have all the femurs yellow, front 
tibiae yellow, middle and hind tibiae fuscous, except at the apices, which are yellow; 
feet as in the females. 
Female. — Average length, 0.10 of an inch. Color of body and antenna 1 uniform 
black, the first with a slight greenish luster. Head about 0.025 of an inch wide, 
about two-thirds as long; the antennae a little enlarged at the ends, hairy, micro- 
scopic hairs moderately scattered over the head and thorax. Thorax, as well as 
head, punctured; wings hyaline, dotted over with microscopic hairs, the thorax 
in its widest part about the width of the head. Abdomen gradually tapering from 
near the base, the ovipositor slightly exserted. Color of the legs varies slightly; in 
five specimens the anterior and posterior legs have the femurs fuscous except at the 
ends, the tibiae with basal half fuscous, the rest yellow; the terminal joints of tarsi 
fuscous; the middle pair of legs are yellow throughout except the terminal tarsi. 
Two specimens have all the femurs fuscous, yellow at the ends. One specimen baa 
all the femurs pale red and the tibiae fuscous, but this is probably a change from 
yellow by the poison bottle used in killing. One is marked like the first five, with 
the yellow replaced by pale red ; another is like the first five, except that the middle 
tibiae are a little clouded at base. 
According to the breeding records of Professor Forbes, this species 
issues during June and July, especially from June 13 to July IS. 
