1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 659 



hollowed, the posterior lateral angles subacute; abdomen long, lanceo- 

 late, almost twice as long- as the head and thorax together, subcom- 

 pressed at apex, the tip of the ovipositor being seen projecting upward 

 between the ventral valves; the petiole is about as long as the hind 

 coxa? and trochanters combined, rugose, black, and opaque; legs con- 

 colorons with the body, except the posterior tibine along their upper 

 surface and their tarsi, which are fuscous. Wings hyaline- veins 

 brown. 



Habitat. — Washington, D. C. 



Described from one specimen, labeled tl D. 0., May 18, 1882." It is the 

 largest species known to me, and resembles a species I have reared in 

 Florida from Lachnus australis, named in MS. Aphidius pinaphidis. 



Aphidius procephali n. sp. 



Male.— Length, 2| mm . Black, polished; the 3d abdominal suture and 

 legs, except coxre, brown, anterior pair of legs paler, coxse black, the 

 middle and anterior pairs brownish at apex; antenna 1 , 26-jointed, 

 entirely brown-black, the joints of flagellum being a little longer than 

 wide; disk of rnesouotuin aciculated; metathorax areolated ; abdomen 

 long ovate, depressed; the petiole rugose, about thrice as long as wide; 

 wings, hyaline, iridescent; veins, brown; the 2d branch of the radius 

 about as long as the transverse cubital nervure. 



Habitat. — Washington, D. C. 



Described from one specimen, labeled No. 1021P , reared April 7, 

 1883, from an Aphis, Pyocephalus sp. found on Pinus inops. 



Aphidius pterocornmae n. sp. 



Male. — Length, 2f- mm . Black, polished; abdomen, piceous black; legs, 

 dark brown; coxa3 and trochanters, black; posterior femora, piceous 

 black; antenna?, 22-jointed (iu one specimen the two terminal joints are 

 connate, making but 21 joints); thejoiutsof the flagellum are hardly twice 

 as long as wide ; thorax entirely smooth, polished; metathorax areolated, 

 the surface of some of the areola more or less punctured ; abdomen 

 long ovate, depressed; the petiole rugose, twice as long as wide, and 

 constricted at the middle,; wings, hyaline; veins, brown ; the 2d branch 

 of the radius much longer than the transverse cubital nervure. 



Habitat. — Washington, D. C. 



Described from two specimens, labeled No. 2939°, reared April 5, 

 1883, from willow Aphid, Pterocomma salicicola TJhler. 



Aphidius avenaphis Fitch. 



Praon avenaphis Fitch, Sixth N. Y. Report, p. 98. 



Specimens of what are undoubtedly this species are in the collection, 

 labeled 2721 01 , reared June 17 and 20, 1882, from the wheat Aphis, Sipho- 

 nophora avence. Some specimens agree exactly with Fitch's description ; 

 others vary considerably in color, having the collar, pleura, metathorax, 

 and abdomen entirely brown or more or less dusky; the female has but 



