218 long's second expedition. 



STEPHANUS Jur. 



S. RUFIPES. — Black; abdomen sessile; thorax not remarkably 

 attenuated before. 



Inhabits Pennsylvania. 



Body somewhat sericeous ; palpi pale yellowish ; scutel with a 

 groove on each side, rough ; metathorax rough, and with two 

 slightly elevated, longitudinal, distant lines; wings hyaline; a 

 large, triangular, fuscous, carpal spot ; feet rufous ; posterior 

 pair of tarsi dusky ; abdomen a little rough at base ; oviduct as 

 long as the abdomen. 



Length one-fifth of an inch. 



Although the arrangement of the wing nervures agrees pre- 

 cisely with aS'. coronatus Jur., yet the form of the bod}^ diifers 

 materially, the thorax not exhibiting the remarkable [325] atten- 

 uation before, and the abdominal petiole is not visible. 



ACAENITUS Latr. 

 (Anomalon Jur.) 



A. STIGMAPTERUS. — 9 Black; incisures of the feet white. 



Inhabits North-west Territory. 



Thorax densely punctured; two dilated grooves confluent 

 behind ; scutel united to the thorax by a carinated line each side ; 

 wings tinged with fuliginous ; nervures blackish ; stigma termi- 

 nated before by a small white spot; metathorax with large con- 

 fluent punctures ; terminated on each side behind by a short 

 conic process ; pleura and pectus polished ; tibiae at base, first 

 joint of the tarsi at base, and near the tip of the tarsf, white. 



Length more than one inch. 



Well distinguished by the white points on the wings, and the 

 white annulations of the feet. The head in my specimen is defi- 

 cient. 



IBALIA Latr. 



T. ANCEPS. — Dull ferruginous; wings blacki.sh; abdomen 

 piceous. 



Inhabits Arkansa and St. Peter's rivers. 



Head with a black curved line at base of the antennte ; collar 

 abruptly elevated at anterior edge, and slightly emarginate in the 



