EGG PARASITES OF THE GIPSY MOTH. 181 
Schedius is to all purposes, if not to all intents, a secondary para- 
site upon occasion. In the spring of 1909 a generation was carried 
through to maturity within the larvee 
of Anastatus, and at that time there 
was no difficulty experienced in induc- 
ing the Schedius females to oviposit in 
such. In the course of later experi- 
ments which were designed to deter- 
mine whether there was any preference 
shown between the eggs containing 
healthy caterpillars and those with the 
larve of Anastatus, only the healthy 
eggs were selected for oviposition by 
the parent females. What was more, 
although several later attempts were 
made to force Schedius to oviposit in 0-7) Sthaies Kinane: Eeestalk ane 
eges containing Anastatus larvee,none __ eggs of gipsy moth from which the adult 
: Schedius has emerged, or in which the 
but the first was successful. Schedius larva has been attacked by a 
Oftentimes two or more eggs are secondary parasite. Greatly enlarged. 
deposited in one host. Numerous in-  (O™#"#!) 
stances have been found in which second-stage larvae were feeding 
peaceably side by side as the result of such superparasitism, and 
still more have been observed in which the former presence of more 
than one individual was positively indicated 
by the presence of more than one egg-stalk 
and anal shield, but never, out of many 
thousands of examples under observation, 
has more than one adult parasite issued 
Fic. 22.—Schedius kuvane: from one egg. What happens to the su- 
Larvalmandibles. Greatly : St : . ‘ 
SAE eea (Original) pernumerary individuals is not indicated 
further than that they disappear, and that 
their substance goes to nourish the sole survivor. Whether there 
is an actual struggle for supremacy in which victory comes to 
the strongest, or whether the struggle 
takes the form of a contest to deter- 
mine which shall quickest consume 
the available food supply, the loser 
calmly surrendering his body to the 
winner by way of forfeit, has never re. 23—Tyndarichus nave: Larval man- 
been revealed. dibles. Greatly enlarged. (Original.) 
The story of a triple tragedy is told in Plate XI, figure 3, which is 
drawn from a slide prepared by Mr. Smith. It represents a single 
gipsy-moth egg, which had been attacked by Anastatus before the 
embryonic caterpillar had developed sufficiently to leave perceptible 
