PLATE i 
Platygaster hiemalis 
A. —Outline of egg of Hessian fly showing two groups of Platygaster eggs deposited 
within. X 460. 
B. —Preoviposited egg of Platygaster hiemalis . Note the membranous process at 
each end and the egg nucleus. X 2,300. 
C. —View within a larva of the Hessian fly, showing five Platygaster parasites in 
the blastula stage. . X 35. 
D. —Host carcass containing n cocoons of Platygaster. X 13. 
E. —Parasite egg immediately after oviposition, with nucleus and sperm. Egg was 
deposited in the yolk and under the blastoderm of the host egg. Compare size of egg 
with that of blastoderm cells. X 2,200. 
F. —Portion of a section through a host egg cut across a group of eight parasite eggs 
which were deposited at one time. Five of the eight eggs show sections of the spefm. 
X 2,200. 
(3SO) 
