348
APPENDIX.
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 posterior margins; first and second segments with a lateral, ferruginous 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 antennae, mandibles, and anterior orbits to the bottom of the emargina-tion 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 whh a large ferruginous spot each side, in which is a smaller yellow spot; venter black, fer-