MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID^. 327 



petiole not longer tlian tliick, striated and pu))escent, the second seg- 

 ment with some stria; at base. 



Habitat. — Pennsylvania. 



Type in Berlin Mnsenm. 



Described from a single sj^ecimeu labeled "Peun., Zimmermaun.'* 



iSOCYBUS Forster. 



Hym. Stud., ii, p. 108 (1856). 



(Type, I. f/randis Nees.) 



Head quadrate or siibqnadrate, 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. 



Antenna) inserted at the clypeus, 10-jointed, the scape subclavate, 

 slightly bent; in the 9 the flagellmn is subfiliform, 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 i>rothorax distinctly visible from above, the 

 mesonotum with two distinct farrows (rarely indistinct or suliobsolete), 

 the scutellum convex or sliglitly elevated posteriorly, rounded and 

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

 and witli two oblique fovese in the furrow; metathorax as long as wide. 



Front wings rather long, veinless, except sometimes the submarginal 

 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 ; tlie first segment is longer than wide, rugose or striated, 

 the second, very large, occupying two-thirds of the surfiice, the follow^ 

 ing segments all short. 



Legs rather long, the femora strongly clavate. 



TABLE OF SPECIES. 

 FEMALES. 



Mesouotiim without fuiTows ^.... 2 



Mesouotmu with distinct furrows. 

 CoxiP hhick. 



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

 Pedicel as long ns the first fuuiclar joint, the second funiclar joint shorten 



than the first I. niguiclaVus Ashm. 



Pedicel shorter than first funiclar joint. 



Pleural piece beneath the anterior Aving smooth, not striated. 



I. PALLirES Say. 



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



2. Legs and anteun;e, except the clnl), liright yellow. 



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



I. LONGIVENTRIS Ashldi 



