LONG S SECOND EXPEDITION. 235 



Inhabits North-west Territory and Missouri. 



9 Head black; dilated posterior orbits, and anterior orbits to 

 the emargination of the eyes, ferruginous ; hypostoma, scapus of 

 the antenna) and mandibles, ferruginous; tip of the former 

 acutely emarginate in the middle; flagellum black-brown ; labial 

 palpi testaceous, very long, ciliate with long hairs, three-jointed; 

 terminal joint much compressed, flat, obtuse at tip ; stethidium 

 black; collar and wing-scale ferruginous; scutel with two large 

 yellow [348] spots; metathorax with a transverse, yellow line, 

 and at the base each side a large ferruginous spot; wings a little 

 fuliginous ; pleura with a yellow spot beneath the superior wings ; 

 feet ferruginous ; tergum black, with five broad, bright yellow, 

 somewhat dentated bands, the posterior one abbreviated; first 

 and second segments with each a large ferruginous spot on each 

 side ; venter black, ferruginous at base. 



Length more than seven-tenths of an inch. 



ODYNERUS Latr. 



0. ANNULATUS. — Segments of the tergum yellow on their pos- 

 terior margins ; first and second segments with a lateral, ferru- 

 ginous spot on each. 



Inhabits North-west Territory and Missouri. 



% Head black ; hypostoma yellowish, truncate at tip, and with 

 a small denticle each side; a large triangular spot on the front, 

 front of the scapus of the antennas, mandibles, and anterior or- 

 bits to the bottom of the emargination of the eye, yellowish ; 

 posterior orbit above with a ferruginous spot ; antennae, terminal 

 joint very much compressed, ferruginous, and reflected outward 

 and backward on the two preceding joints; stethidium black ; 

 collar and wing scale ferruginous ; scutel with two yellow spots ; 

 metathorax with a transverse, yellow line, and at the base each 

 side a large ferruginous spot ; wings a little fuliginous ; pleura 

 with a yellow or ferruginous spot beneath the superior wings ; 

 feet ferruginous ; tergum black with six broad, bright yellow 

 bands; first segment ferruginous excepting the posterior margin, 

 with a black spot in the middle ; second segment with a large 

 ferruginous spot each side, in which is a smaller yellow spot; 

 venter black, ferruginous [349] at base ; posterior segments with 

 yellow posterior margins. 



Length more than half an inch. 



