60 PROC. ENT. soc. WASH., VOL,. 22, NO. 3, MAR., 1920 



cophila pergandei Scudd., Atheta impressipennis Bernh. and De- 

 carthron stigmosum Lee. were taken and in addition the follow- 

 ing undescribed Proctotrypid : 



Megaspilus crawfordi, sp. nov. 



Female.- -Length, 2 mm. 



Head and thorax shining, finely punctate and with abundant white hairs. 

 Eyes broadly oval, pilose; front of head impressed. Antennal scapes about 

 as long as head including mandibles; first three flagellar joints subequal in 

 length and a little longer and more slender than joints 4-9; terminal joint 

 slightly shorter than the two preceding joints together, strongly compressed. 

 Maxillary palpi four-jointed, the terminal joint distinctly longer than the 

 others. Thorax nearly fiat above; scutellum flat and punctate similarly to 

 remainder of thorax. Wings linear, extending to a point a little in front 

 of middle of first abdominal segment. Legs slender. Abdomen smooth 

 and very shining; first segment with three strong basal costal, about one- 

 fifth as long as the segment ; apical portion of abdomen triangular and acum- 

 inate and pointing upward at tip. Color, black; base of antennal scapes 

 and legs brown with the femora and tibiae darker than the tarsi. Wings 

 hyaline basally, strongly infuscated at tips. 



Host. Formica exsectoides Forel. 



Described from two females taken in mounds of the host 

 ant at Great Falls, Md. (October, 1919). 



Type Cat. No. 22622, U. S. N. M. 



M. canadensis Ashmead, the most closely related species, 

 differs at its more elongate abdomen, which at base has a series 

 of ten costae, and the first segment is distinctly, though shallowly, 

 punctate above. 



This is the first species of its genus to be recorded from ant 

 nests in America, but a number of European species have been 

 noted as myrmecophilous in habit. 



Actual date of publication March, 22 1920. 



