12 Descriptions of new species of Hymenoj)tera. 



tral cellule small, quadrangular, longitudinal, somewhat 

 oblique, not distinctly narrowed at either end; posterior 

 tarsi at their tips dusky; abdomen depressed; venter 

 with a dusky spot near the tip. 



Length $ nearly three-tenths of an inch. 



S. I. malaeus. Body black; antennae annulate with 

 white, beginning at the tenth joint and terminating at the 

 eighteenth; joints very distinct; wings blackish; small 

 cellule with one bulla, larger anal cellule with three bul- 

 lae and two short processes; met a thorax with elevated 

 lines; abdomen with an impressed line each side. 



Length more than half an inch. 



o w 



9. I. pect oralis. Black; abdomen rufous; antenna? 

 blackish, whitish near the middle. 



Inhab. Indiana. 



Body black; orbits and all beneath the antenna?, yel- 

 low; antennse blackish, 13, 14, 15, 16 joints white; tho- 

 rax with a white line before the wings, interrupted be- 

 fore; scutel and transverse line beneath it, yellow; loings 

 hyaline, central cellule pentangular, transverse; pleura 

 black; jjectus black, with a large yellow spot between 

 the intermediate ancr posterior feet; feet yellow; poste- 

 rior thighs tinged with rufous; posterior tibiae rufous at 

 tip; abdomen rufous, with black incisures. 



Length over one-fifth of an inch. 



10. I. bifasciatus. Ferruginous; wings dusky, bifas- 

 ciate. 



Inhab. Indiana. 



Body ferruginous; antennas somewhat linged with 



.whitish beyond the middle and fuscous at tip; thorax 



circumscribing incisure black; tvings dusky with a hya- 



