EGG PARASITES OF THE GIPSY MOTH. 179 
definitely proved to be primary, was the prime argument which finally 
resulted in the detachment of Mr. H. S. Smith from the cotton boll 
weevil investigations and his transfer to the laboratory staff. By 
the time he was prepared to undertake his new work a large number 
of eggs from which Anastatus, Tyndarichus, and Pachyneuron were 
positively known to have issued were ready for dissection and study, 
and to these were soon added a number from which Schedius was 
similarly known to have come, secured in the manner about to be 
described. 
The first Schedius which was ever reared in a living condition 
issued from an isolated egg in the laboratory in December, 1908. It 
was a male, and it died before it could be furnished with a mate. 
The next individual issued on January 8 from an egg which had been 
isolated on December 19. It was a female, and she was immediately 
transferred to a large vial containing an egg mass freshly collected 
from the field. Within a few days after being thus confined she was 
observed in the act of oviposition, and parthenogenetic reproduction 
ensued. Her progeny began to issue 
February 16, and up to February 25 
no less than 28 males were reared. 
The experiment was tried of con- 
fining her with several of her asexu- 
ally-produced progeny in the hope 
that she might thus be fertilized and 
produce females. The experiment Fig. 18.—Schedius kuvanz: Egg. Greatly en- 
s : larged. (Original.) 
did not succeed at that time, appar- 
ently because she was not able to deposit any more eggs. She 
remained alive until March 2, but was dead on March 6, after at 
least eight weeks of active life. 
The eggsfrom which these parthenogenetically-produced males issued 
were known beyond peradventure of a doubt to have produced Sche- 
dius, and never to have contained any other parasite, and together 
with those from which Anastatus, Tyndarichus, and Pachyneuron ’ 
were known to have issued, made complete the series which was to 
be dissected. 
The dissection work was mostly done by Mr. Smith, but he was 
not alone when it came to puzzling over the problems in parasite 
anatomy and parasitic interrelations which this work produced in 
abundance. The contents of the individual eggshells were scruti- 
nized with the utmost care, and slowly the various anatomical 
remains found therein were associated with one parasite or another. 
In the course of these studies it was discovered that Schedius 
deposits a large egg (fig. 18), which is supplied with a very long 
stalk. The egg is placed within the body of the unhatched but 
fully formed caterpillar, with the end of the stalk projecting outside. 
