1864.] '507 



Descriptions of two new genera of North American ICHNEUMONID.S. 



BY E. T. CRESSON. 



GROTEA nov. gen. 

 Head subglobose ; face prominent; eyes moderate, ovate, obtusely 

 emarginate opposite the insertion of the antennae ; ocelli placed in a 

 triangle on the vertex ; clypeus slightly ti-ansverse, broadly rounded 

 at base, deeply impressed on the disk, rounded and recurved at tip ; 

 mandibles moderate, deeply bifid at tip; palpi filiform, rather slen- 

 der; the throat, immediately behind the oral cavity, is narrowed on 

 each side into an acute tooth. Antennse, long and slender, slightly 

 thickened at the tip, with about 46 joints; the basal joint robust, 

 short and globose, obliquely truncate exteriorly and receiving the 

 2nd and ord joints, which are minute ; 4th joint long ; 5th about half 

 the length of the 4th; remaining joints gradually shorter, the terminal 

 one pointed. Thorax long and narrow, much prolonged before the 

 wings (Fig. 1, a), rounded in front; pectus gra- Fig. 1. 



dually pointed behind and extending to the tip of 

 the tegulfB ; mesothorax oblong-ovate, depressed ; 

 pleura rather large, excavated beneath the wings; 

 scutellum small, subquadrate, convex ; metathorax 

 rather small, convex. Wings (Fig. 1, i) mode- 

 rately long, narrow ; stigma long and narrow, re- 

 moved further towards the tip of the wing than usual ; marginal cell 

 elongate, sublanceolate, extending all the way to the apex of the wing, 

 the lower nervure faintly curved towards the tip ; submarginal cell 

 elongate, receiving the first recurrent nervure about the middle; areolet* 

 removed nearer to the tip of the wing than usual, broad, 5-angular, the 

 side nervures oblique, the second recurrent nervure almost straight, 



faintly sinuate in the middle, and received by the areolet a little beyond 



♦ 



* The areolet is too square in the figure ; the lateral nervures should be more 

 oblique, so as to make the posterior jjart broader, and the lower nervure should 

 be slightly angular at the junction with the 2ud recurrent nervure which is 

 nearer the tip of the areolet than is represented in the figure. 



