PLATE i 
Platygaster vemails: 
A. —Longitudinal section of egg before oviposition. X 397. 
B. —Longitudinal section of egg immediately after oviposition. X 391. 
C. —Longitudinal section of Hessian fly larva containing a vernalis egg within the 
midintestine. X 29. 
D. —Sagittal section of Platygaster vernalis egg about n days old, showing four 
embryos in the blastula stage of development and numerous paranuclear masses 
present. X 695. 
E. —Parasite mass of Platygaster vernalis containing eight embryos at an advanced 
stage of development. X 87. 
Explanation of symbols on Plates 1-4 
mi—midintestine. 
mth—mouth. 
emb=embryo. 
gc=germ cell. 
go=gorgeret. 
md=mandible 
egg=egg. 
mx—maxilla. 
pn=paranuclear mass. 
pr=proctodaeum. 
sh=sheath. 
ssp=stemal spatula. 
stw=stomach wall, 
styl—stylet. 
