26 
about the trees defoliated by the caterpillars of this insect. A female 
of the Chalcis was watched while engaged in ovipositing in a fresh 
chrysalis. She flew around the trunk of the tree, examining one cocoon 
after another, perhaps six in all, until she found a male cocoon contain- 
ing a freshly transformed pupa. This cocoon she felt over from one 
end to the other, her antenne constantly vibrating. Finally she inserted 
her ovipositor, withdrawing it after a few seconds, then inserted it 
again and again a third time. At the fourth insertion she apparently 
penetrated to the right spot, for she forced her ovipositor through the 
silk, hugging the cocoon close and pushing her abdomen as close as 
possible to the pupa. In this position she remained two and a half 
minutes, finally withdrawing her ovipositor, walking to the upper end 
of the cocoon and remaining for a minute or two actively cleaning her 
legs and antenne, rubbing them against each other for some time, after 
which she was cap- 
tured. The pupa 
which had been 
stung was placed 
in a vial, and from 
it on September 
14 there issued a 
healthy male moth. 
We can not sur- 
mise the cause of 
failure of this ap- 
parently success- 
ful oviposition on 
the partof the par- 
asite. OnSeptem- 
ber 10 another 
Fia. 12.—Chaleis ovata: a, pupa; b, parasitized pupa of Orgyia; c, adult; specimen was ob- 
d, outline of same from side; e, pupal exuvium—enlarged (original). 
served ovipositing 
in a pupa which was evidently several days old and which bore signs of 
having been previously parasitized. This second pupa was preserved, 
but did not give out an adult parasite. It died and dried up. Another 
specimen was observed ovipositing in a shrunken larva which bore a 
Tachinid egg on the dorsum of the sixth abdominal segment. The 
movements of a large dipterous larva could be seen through the skin of 
the caterpillar. This specimen also was placed in a vial, but eventually 
dried up and no parasite issued. The two adult specimens observed 
Ovipositing on the 10th were placed in vials with cotton stoppers and 
on the 11th were still alive and active. They were removed to ditfer- 
ent tubes aud provided with pup of the tussock moth in an advanced 
state of development. One of them oviposited in the same pupa twice 
and the other once. On the following day (September 12) both died. 
On the 15th the moth issued from one of the pup oviposited in on the 
