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Ophion bilineatum Say. 
This species is mentioned in this connection with, unfortunately, no 
certainty as to whether it is a parasite of the Orgyia or not. The 
reason for introducing it is simply that in December, 1896, a single 
specimen of its easily recognizable cocoon was found in a mass of the 
Orgyia cocoons and apparently inclosed in the outer envelope of one. 
The cocoon was opened, but the adult had issued at some previous 
time. On the whole, it is not likely that it was a parasite of the 
tussock-moth caterpillar. Ordinarily this species is reared from larger 
Bombyeids, such as the Arctians and Saturnians, and it is quite likely 
that the larva making this cocoon had issued from a larva of one of 
these groups, had spun its cocoon upon the bark of the tree where it 
was subsequently found, and had afterwards been spun over by the 
Orgyia larve in making their own cocoons. 
Ichneumon subcyaneus Cresson. 
This species was observed in September investigating full-grown 
larve and recently spun cocoons of the Orgyia. The writer watched 
several specimens, and has little doubt that it may be put down asa 
parasite of this species, although no specimens were actually reared. 
It is a widespread species recorded from Canada and generally through- 
out the United States, and is said to have been reared from several 
Bombycids, as well as from Nematus ventralis. 
Ichneumon ceruleus Cresson. 
The same statement may be made regarding this species. It was 
observed in September, 1895, under exactly similar circumstances, and 
has practically the same distribution, but has been reared only from 
pup of Bombycids. 
TELENOMUS EGG PARASITES REARED FROM OTHER SPECIES OF 
ORGYIA. 
Telenomus californicus Ashmead.—There are four female specimens 
of this genus in the collection of the United States National Museum, 
which were reared by Mr. EKhrhorn from an egg mass of a species of 
Orgyia at Mountain View, Cal. 
Telenomus orgyie Fitch.—This minute egg parasite issues from the 
egg mass of the closely allied Orgyia nova. With this insect the eggs 
are left naked and not covered with the white, frothy substance with 
which the female of O. lewcostigma covers and hides her egys. It may 
result from this fact that this parasite will not be reared from the egg 
mass of the species of Orgyia under consideration. It has been reared 
from the eggs of a species of Orgyia at Ottawa, Canada, by Mr. W. H. 
Harrington, as well as by Dr. Fitch in New York. The species referred 
