MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPIDiE. 325 



longer than the preceding. In S the antennae are slightly longer, 

 cylindrical, with a short whitish pubescence; the pedicel is longer than 

 the second funiclar joint; the first very minute, closely joined to the 

 second ; the second swollen, nearly as broad as long; the club 6-joint/edj 

 the first joint the shortest, the last the longest, cone-shaped, the inter- 

 mediate joints twice as long as thick, subpedicellate. Thorax ovate, a 

 little more than twice as long as broad; parapsidal furrows deei», dis- 

 tinct; scutellum rounded, convex; the metathorax short, emarginate 

 behind. Wings hyaline, veinless, although sometimes the base of the 

 submarginal vein is quite distinctly visible as a yellowish streak. Legs 

 piceous-black or rufo-piceous; sometimes the base of the tibiab and the 

 base of the tarsi yellowish ; tarsi most frequently fuscous. 

 Habitat. — Western and Northern States. 



Types in National Museum. A common parasite of the Hessian fly 

 { Cecidomyia destructor Say). 



From Mr. W. H. Harrington, I received a S specimen of this species 

 labeled ^^Aneurhynchus aneurus Prov. Type". 



Platygaster obscuripennis, 8p. nov. 



$ 9 . Length 1.40 to 1.80"". Very closely allied to P. HerricTcii, but 

 a little more slender, the face with a large polished space in the middle. 

 Mandibles pale. Antennae slender, the flagellum dark brown; pedicel 

 not quite as long as the first two funiclar joints together, but longer than 

 the second joint alone, the tip yellowish; the first funiclar joint small, but 

 longer than thick; second twice as long as thick; club C-jointed, the 

 first narrower than the others, the joints beyond to the last about equal, 

 longer than thick, the last conic, longer than the preceding. Sides of 

 the parapsides smooth with a distinct grooved line parallel with the 

 pronotal suture. Wings dusky, or subhyaline. Abdomen not longer 

 than the thorax, the foveolaB at base of second segment and the first 

 segment both above and beneath covered with a silky pubescence. The 

 S difffers decidedly firom P. Herrickii in having the first five joints of 

 the club wider than long, the last cone-shaped, about twice as long as 

 the preceding, while the second funiclar joint is but slightly swollen and 

 slightly curved. 



Habitat. — Ottawa, Canada. 

 Types in Coll. Ashmead. 



Described from specimens received from Mr. W. H. Harrington. 



Platygaster aphidis sp. nov. 



$. Length, 1.6'"'". Black, shining; the head posteriorly almost 

 smooth, not distinctly punctate; face polished. Antennae 10-jointed, 

 black; pedicel as long as the first and second funiclar joints together, 

 the first small, subtriangular, closely united to the second, the second 

 somewhat swollen and slightly twisted; club 6-joint°,d, the joints about 



