642 REPORT OF NEW JERSEY STATE MUSEUM, 



PACHYNEURON Wlk. 



P. altiscuta How. New Jersey district. 



P. micans How. A parasite on the wheat louse. 



P. aphidivorum Ashm. Parasitic on the cabbage plant louse. 



P. nigrocyaneum Nort. Bred from "Lophyrus abietis." 



ISOCRATUS Fbrst. 



I. vulgaris Wlk. New Brunswick VII, 20 (Sm); reared from "Aphis 

 rosse," "Agromyza lutea" and "Curculio pomorum." 



HOMOPORUS Thorns. 



H. chalcidephagus Walsh. Parasitic on "Isosoma hordei." 

 H. subapterus Riley. (Micromelus) A parasite of the Hessian fly. 



MERISUS Wlk. 



M. destructor Say. (Micromelus) Also lives in the Hessian fly. 

 M. fulvipes Forbes. Also on the Hessian fly. 

 M. isosomatis Riley. Reared from "Isosoma tritici." 



ARTHROLYTUS Thorn. 



A. apatelae Ashm. Bred from "Acronycta populi." 



A. pimplse Ashm. Parasitic on "Pimpla inquisitoriella." 



DIBRACHYS Fbrst. 



Fig. 260. Dibrachys bouchcanus: female adult and antenna of 

 male: both enlarged. 



D. boucheanus Ratz. Throughout the State. Bred out of the American 

 tent caterpillar and in thousands as a secondary parasite out of 

 Cecropia cocoons parasitized by "Pimpla" and "Spilochalcis." Breeds 

 in many other primary parasites. 



