0DYNERUS. 319 



2d; it is longer than wide. The whole insect strongly punctated ; 

 the thorax roughly punctured; the edge of the 2d segment having 

 a line of strong punctures beneath, as well as on the dorsal side. 



Black; a spot on the forehead, inner border of* the orbits, a dot 

 behind each eye ; an interrupted border on the anterior edge of 

 prothorax, a spot under the wing, post-scutel, tegulse, and post- 

 tegulse, and the ridges of metathorax, yellow; the tegulas with a 

 brown spot; all the segments of the abdomen bordered with 

 yellow, the first fascia fused with a lateral spot ; the 2d segment 

 adorned on each side with a clear yellow spot; beneath black ; 

 feet black at base ; knees, tibiae, and tarsi yellow. Wings hyaline, 

 nerves brown, with a brown cloud in the radial cell. 



% . Clypeus very slightly emarginate, yellow ; mandibles and 

 antennae beneath, yellow. Femora and coxae anteriorly yellow. 



Bess. a. diff. — Yery closely allied to 0. conformis, but not as 

 cylindrical. — Compare also the following species. 



Hab. North America. Baltimore, Ohio, New York, Con- 

 necticut (E. Norton), Illinois (B. D. Walsh), Missouri (Say), 

 New Mexico. 



120. O. Toas Ckesson. — Niger ; clypei summi fascia, punctis capitis, 

 scapi fascia, pronoti maculis 2, tegulis, macula subalari, post-scutello, 

 maculis 2 metanoti, abdominis segmentorum limbo, nee non maculis 2 

 basalibus 2' et maculis 2 confiuentibus primi, albidis ; secundo seg- 

 mento margine retlexo ; pedibus runs, genibus flavidis. 



Odi/n. Toas Cresson, Amer. Ent. Trans. I, 1867, 381, 24. 

 Total length, 4 lin. 



9. Black, densely and deeply punctured; a lunate line at base 

 of clypeus, spot at base of mandibles, another above insertion of 

 antenna), another in the emargination of eyes, and a short line on 

 posterior orbits, pale yellowish-white ; clypeus with longitudinal 

 punctures, narrowed at tip, which is subemarginate ; apical half 

 of mandibles ferruginous; palpi pale; antennae with the scape 

 whitish on the outside; two transverse spots on prothorax, 

 tegulee, except a dusky medial dot, a large spot beneath and a 

 small spot behind tegulse, poSt-SCUtellam, and a transverse mark 

 on each side of metathorax, pale yellowish-white; metathorax 

 rugulose, truncate, and subexcavate behind. Apical margin oi' 

 all the abdominal segments, except the last, yellowish (that on 

 the basal segment confluent, with a lateral subtriangular spot; 

 thai on the second sinuous anteriorly), and sub-basal, transverse 



