MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPIDiE. 327 



petiole not longer tlian thick, striated autl pubescent, the second seg- 

 ment with some strise at base. 



Habitat. — Pennsylvania. 



Type in Berlin Museum. 



Described from a single specimen labeled "Penn., Zimmermann." 



ISOCYBUS Forster. 



Hyra. Stud., n, p. 108 (1856). 



(Type, I. (jrandis Nees.) 



Head quadrate or subquadrate, the vertex broad, the cheeks full, the 

 occiput slightly emarginate, not or very delicately margined ; ocelli 3, 

 triangularly arranged, the lateral being placed far away from the 

 margin of the eye ; eyes ovate. 



AnteuDfe inserted at the clypeus, 10-jointed, the scape subclavate, 

 slightly bent; in the $ the flagellum is subtiliform, the six terminal 

 joints thicker than the preceding, submoniliform, the first and second 

 ioints very slender; in the $ the second fiiniclar joint is usually slightly 

 swollen and slightly curved. 



Thorax long-oval, the prothorax distinctly visible from above, the 

 mesonotum with two distinct furrows (rarely indistinct or subobsolete), 

 the scutellum convex or slightly elevated x>osteriorly, rounded and 

 unarmed at apex, distinctly separated from the mesonotum by a furrow 

 and with two oblique fovese in the furrow; meta thorax as long as wido. 



Front wings rather long, veinless, excei)t sometimes the submargiuiil 

 vein, which is however always pale and never knobbed at tip ; usually it 

 is only visible as a hyaline streak. 



Abdomen oval, ovate, or oblong-oval, usually as long as the head and 

 thorax united; the first segment is longer than wide, iiigose or striated, 

 the second, very large, occupying two-thirds of the surface, the follow- 

 ing segments all short. - . 



Legs rather long, the femora strongly clavate. 



- . TABLE OF SPECIES. ^ — u 



FEMALES. 



Mesonotum •without furrows 2 



Mesouotuni with distiuct furrows. 

 Coxm black. 

 Legs and antennie, except club, pale brownish or honey yellow. 

 Pedicel as long as the first fuuiclar joint, the second funiclar joint shorter 



than the first I. nigricijivus Ashm. 



Pedicel shorter than first funiclar joint. 

 Pleural piece beneath the anterior wing smooth, not striated. 



I. PALLIFES Sayi 



Pleural piece beneath the anterior wing striated I. canadensis Prov. 



2. Legs and anteunas, except the club, bright yellow. 



Abdomen nearly twice as long as the hetul and thorax united. 



I. LONGIVENTRIS Ashm. 



