138 
PAEASITES OF GIPSY AND BROWN-TAIL MOTHS. 
mentioned as one of the more common parasites by Forbush and 
Fernald, but it is possible that the next following species is intended. 
PlMPLA CONQUISITOR SAY. 
Judging from observations made from time to time in the field 
the pupae of the gipsy moth are frequently attacked by this species, 
but, unfortunately, the young larvae of the Pimpla appear not to 
thrive upon this host and rarely complete their transformation. It 
is safe to say that more female Pimplas will be found attacking the 
gipsy-moth pupae in the course of a day's observations in the held 
at the proper season of the year than would be reared if that day 
were to be spent in collecting pupae instead. It is believed that the 
affected host usually dies, but the subject has not received the atten- 
tion which it deserves. If it is true, Pimpla conquisitor may prove 
to be of some assistance in the control of the moth. 
Pimpla tenuicornis Cress. 
Recorded as a parasite by Forbush and Fernald, but never reared 
at the laboratory. Possibly P. conquisitor was actually the species 
reared. 
DlGLOCHIS OMNIVORA WALK. 
Mentioned by Forbush and Fernald as of some consequence as 
having been reared from this host, but during late years it has been 
so rare that only a single pupa has been found in which it has com- 
pleted its transformations. 
Anisocyrta sp. 
Mentioned by Forbush and Fernald, but the record has not been 
confirmed by later rearing work. 
LlMNERIUM SP. 
A single cocoon, which was directly associated with the remains 
of the host caterpillar, was collected by Mr. R. L. Webster in 1906 
during his association with the laboratory. It was very likely that 
of L. fugitiva Say, but the fact will never be known, because a speci- 
men of Ilemiteles utilis Norton, a hyperparasite, actually issued. 
Apanteles sp. 
In 1910 a colony of the caterpillars of the white-marked tussock 
moth was established^ upon some shrubbery in a locality where the 
gipsy moth was fairly common. The young caterpillars were spar- 
ingly attacked by a species of Apanteles, possibly A. delicatus How., 
although the fact was not determined. At the same time and place 
a young gipsy-moth caterpillar was found from which an Apanteles 
