ODYNERUS. 273 



dorsalis; its apical margin emarginate, concave. Metathorax 

 perhaps a little more depressed, without any superior ridges ; its 

 lateral angles very pronounced*, compressed horizontally. First 

 abdominal segment shorter than in 0. dorsalis; the second rather 

 velutinous, scarcely punctate, its margin more coarsely punctate 

 (the punctures being rather holes), but not so- evidently canali- 

 culate as in 0. dorsalis. 



Insect black, with fulvous, velvety hair. Apex of mandibles 

 and base of scape beneath, ferruginous. A spot on base of the 

 mandibles, an ovate mark on both sides of the clypeus, and two 

 others near the apex, inner orbits of the eyes and a line behind 

 them, two triangular maculae, forming the anterior border of 

 prothorax, tegulae except their base, two spots on scutellum and 

 two on mesothorax, yellow; 1st abdominal segment yellow above 

 with a trilobate black emargination; a narrow border of segments 

 2d, 3d of the same, yellow. Knees, tibiae, and tarsi, yellow. 

 Wings dark fusco-violaceous. The mandibles and palpi are 

 formed as in 0. dorsalis. 



Hub. United States (Florida, 1 9, E. Norton). 



94. O. ailiaulatiis Say. — 0. arvensi affinis, 9 gracilior, £ capite 

 mnjore, valde punctatus, secundo abdominis segniento dense punctato, 

 margine impresso, crasse punctato. Niger vel ferrugineus, mesonoto et 

 abdominis segmentis 3-6 nigris ; tegulis, pedibusque runs ; pronoti et 

 abdominis segmentorum margine, post-scutello metanoti marginibus, 

 subfnreis; primo abd. segniento utiinque rufo et flavo ornato ; alis 

 nebulosis. — 9 . Scapo, clypeo, frontis maculis, rufis. — Variat clypei 

 fascia nigra, macula subalari maculisque 2 secundi segmeuti, rufis vel 

 fiavis. — % . Clypeo polygonal i ; fronte, scutellis, macula subalari flavis. 



Odyn. annulatus Say, Long's Sec. Exp. Append. 29 (II, 348). — Say's 

 Ent. (Le Conte), I, 235. — Sauss. Et. Vesp. I, 232. — Ckesson, Amer. 

 Ent. Trans. I, 1867, 380, 21. 



Rhynchium annulatum Say, Eost. Jonrn. I, 1837, 351, 4. — Say's Ent. (Le 

 Conte), II, 765, 3.— Sacss. Et. Vesp. Ill, 184. 



Odyn. Bairdi Sauss. Revue Zool. X, 1858, % . 



9. Total length, 15 mm.; wing, 12 mm. 

 % . Total length, 10 mm. ; wing, 8 mm. 



• 9. Rather slender, densely and coarsely punctate. Clypeus 

 broadly pyriform, strigate punctate, terminating in two approxi- 

 mate little teeth, separated by a small lamellar edge. Thorax 

 subelongate. Post-scutel truncate, very tenuously crenulate. 

 13 



