68 Wisconsin Academy of Sciences, Arts and Letters . 
Table II. 
Ovarioles in right ovary. 
Left ovary. 
Total in both. 
28. 
23 
51 
21...... 
23 
44 
27 . 
25 
52 
25. 
27 
52 
25. 
24 
49 
30.. 
28 
58 
Average 26 
25 
51 
Alternating with each egg-chamber is a nutritive or yolk- 
chamber ; these can be distinguished as such, with the naked 
eye, only at the basal end of the ovarian tubule by the larger 
size of the egg-chambers. An examination of ovarioles mounted 
in toto shows there are about eight to ten well defined egg- 
chambers alternating with the same number of nutritive cham¬ 
bers. If all of these well defined eggs were to reach maturity, 
the females would be able to deposit between four and five 
hundred eggs; but since many more may be developed from the 
terminal filament, the question of the number of eggs that a 
female may lay remains an open one. 
PARASITE OF THE EGG. 
There is a species of Hymenopteron which is parasitic on 
the eggs of Cimbex americana. It is a true internal parasite 
of the egg, passing all stages, excepting the imago, within the 
egg. Mr. C. T. Brues has kindly identified this species as 
Trichogramma pretiosa Riley. This Hymenopteron according 
to Girault (2) attacks no less than eleven or more hosts. A 
glance at the following list shows that the parasite attacks eggs 
of insects belonging to families which are often not very 
closely related. Undoubtedly the Chalcis-fiy has a wide dis¬ 
tribution. 
