Apr. 1, 1925 
Two Imported Egg Parasites of the Gipsy Moth 
675 
During the most favorable seasons 
Anastatus should be able to parasitize 
at least 35 per cent of the gipsy-moth 
eggs over a considerable portion of the 
infested area. 
It is an important fact that the para¬ 
sitism by Anastatus of the gipsy-moth 
eggs increases as the egg clusters de¬ 
crease in size. There is a tendency for 
the egg clusters of the gipsy moth to 
decrease in size after years of great 
abundance. During a year of great 
abundance of this parasite, when sev¬ 
eral Anastatus females are ovipositing 
in the eggs, even while the egg cluster 
is being deposited, the average percent¬ 
age of parasitism may run considerably 
higher than has yet been obtained. 
Schedius is also proving to be an 
important parasite of the gipsy-moth 
eggs in the southern part of New 
England, but apparently it is not able 
to work to its best advantage in the 
more severe climates of the northern 
part of the territory infested by the 
gipsy moth. 
In the southern area during favorable 
seasons Schedius should parasitize from 
30 to 40 per cent of the eggs of the 
gypsy moth. The fact shown in labo¬ 
ratory experiments that Schedius can 
reproduce readily in the eggs of several 
species of insects in addition to those 
of the gipsy moth may at any time 
add to the value of this introduction. 
