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PARASITES OF GIPSY AND BROWN-TAIL MOTHS. 
which is the next parasite to be considered, has had the opportunity 
which Compsilura has demanded in each instance in which it has 
been colonized, to prove itself of value. 
ZYGOBOTHRIA NIDICOLA TOWNS. 
Pretty much everything which has been said of Careelia may be 
said of Zygobothria, not so much because it is similar in its habits 
as because we have very little first-hand knowledge of its habits. It 
probably deposits living maggots upon the body of its host or else 
very thin-shelled eggs containing maggots ready to hatch; but this 
is not certainly known. It always leaves its host before pupation 
and forms a free and characteristic puparium with roughened surface 
and protruding stigmata very unlike that of any of the other tachinid 
parasites of the same host. 
It is not quite so common as a parasite of the gipsy moth as is 
Careelia and not so many have been colonized, but the colonies have 
been very satisfactory notwithstanding, and there is about as much 
reason to expect the establishment of this species as in the case of 
any of the others. Like several of the others, it was not colonized 
until 1909, and its recovery is hardly to be expected until 1911 or 
1912, and as in the case of these others its estabhshment and value 
as a parasite will very largely depend upon its ability to find a suffi- 
cient supply of acceptable hosts. 
CROSSOCOSMIA SERICARLE CORN. 
Many years have passed since Dr. Sasaki published the most 
interesting and surprising results of his investigations into the life 
and habits of the so-called "uji" parasite of the silkworm in Japan, 
and his account of the manner in which this serious enemy of that 
insect gained access to its host was so extraordinary in the light 
of that which was known concerning the oviposition of tachinids in 
general as to cause the truth of his discovery to be questioned by 
several eminent entomologists. 
His work has been most carefully reviewed in connection with the 
investigations which have been carried on at the laboratory into 
the life and habits of the allied species, Blepharipa scutellata, and it 
was with much satisfaction that his account of the biology of Crosso- 
cosmia was found to apply almost equally well in nearly all of its 
details to the biology of the European parasite of the gipsy moth. 
There was one important point of difference, however, in that the 
first-stage Blepharipa was never found ensconced in the ganglion of 
its host, while (Yossocosmia, according to Dr. Sasaki, habitually 
chooses this position. 
In 1908 quite a number of the puparia of a Japanese parasite of 
the gipsy moth was received from that country, which, so far as 
