138 PARASITES 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. 



Pimpla 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 field 

 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 Hemiteles 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 



