S-iS APPENDIX. 



spots; metuthorax 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 ; /ee/ ferruginous J 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. 



'O"- 



ODYNERUS, Latr. 



0. annulatus. Segments of the tergum )'^ellow on their 

 posterior margins ; first and second segments with a late- 

 ral, ferruginous spot on each. 



Inhabits North-west Territory and Missouri. 



S Head black ; hypostoma yellowish, truncate at tip, 

 and with a small denticle each side ; a large triangular spot 

 on the front, front of the scapiis of the antennje, mandi- 

 bles, and anterior orbits to the bottom of the emargina- 

 tion of the eye, yellowish ; posterior orbit above with a 

 ferruginous spot ; antennse, terminal joint very much com- 

 pressed, ferruginous, and reflected outward and backward 

 on the two preceding joints ; stethidium black ; collar and 

 wing-scale ferruginous ; scutel with two yellow spots j 

 inetathorax with a transverse, yellow line, and at the base 

 each side a large ferruginous spot; wings a little fuligi- 

 nous ; 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, fer- 



