264 HTMENOPTERA OF AMERICA. [ PART I. 



to the true Odynerus, considering the form of the lateral angles 

 of the metal horax and the presence of the post-scutellar teeth. 

 It resembles them more in the strongly punctured border of the 

 2d and following segments. 



This specii s has the thorax built up upon another system from 

 the O. Boscii and its neighbors; it is less excavated; the superior 

 ridges are more convergent and the teeth which terminate them 

 at I he summit are spiniform and almost applied to the post-scutel. 



Compare with the 0. spinifer, which presents similar characters 

 (Divis. Stenodynerus). 



Hob. California (Berton). 



** Tlie superior edges of metathorax very slight, only farm in g behind the post-sciiiel 

 two very small teeth. 



SS. O. CordOYse Sauss. — Niger, sericeus ; capite et thorace rugose 

 punctatis; post-soutello crenulato ; metanoto utrinque obtuse subangu- 

 lato, foveola subplanata, supeme acutiuscule marginata ; abdoinine 

 ovato-conico, segtnentoruin 2-5 margine crassiuscule pnnetato ; clypeo 

 summo, scapo subtns, capitis et pleurarum maculis, pronoti inargini- 

 bus, tegulis, punctis 2 scutelli ; post-sootello, metanoti angulis, abdo- 

 minis segmentorum 2-5 margine, primi utrinque macula, auo, tibiis 

 tarsisque, flavis ; alis subferrugineis apice griseis. J. 



Odyn. Cordova Sauss. Revue et Mag. de Zool. XXII, 1870, 58 10, J. 



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



9. Head and thorax densely and roughly punctate. Forehead 

 a little sulcate. Prothorax having its anterior margin convex, 

 reflexed, subangulate; post-scutel crenulate. Metathorax very 

 coarsely punctured above, rather flattened behind; its convexity 

 not deep, strigose, not margined, except superiorly, where there 

 exists a little oblique ridge, produced by the rugosities, forming 

 a little tooth behind the post-scutel ; this is separated from the 

 post-scutel by a sort of fissure. Lateral angles of metathorax 

 distinct, but blunt. Abdomen ovate-conical, truncate at base, 

 smooth and sericeous. Second segment very finely punctured: 

 its margin and the following segments strongly punctured. 



Black; mandibles rufous; scape beneath, frontal, ocular, and 

 post-ocular macula, yellow. Anterior and posterior margins of 

 prothorax, a spot under the wing, teguhe, two spots oc the scutel, 

 post-scutel, and angles of metathorax yellow; segments 2-5 of 

 the abdomen regularly and rather widely margined with yellow; 



