2G4 HYMENOPTERA OF AMERICA. [PART I. 



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

 of the metathorax and the presence of the post-seutellar teeth. 

 It resembles them more in the strongly punctured border of the 

 2d and following segments. 



This species has the thorax built up upon another system from 

 the 0. Boscii and its neighbors; it is less excavated; the superior 

 ridges are more convergent and the teeth which terminate them 

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



Compare with the 0. spinifer, which presents similar characters 

 {Dims. Stenodynerus). 



Hab. California (Berton). 



** The superior edges of metathorax very slight, only forming behind the post-scutel 

 two very small teeth. 



88. ©. CordOTSe Sauss. — Niger, sericeus ; capite et thorace rugose 

 punctati.s ; post-scutello crenulato; metanoto utrinque obtuse subangu- 

 lato, foveola subplanata, superne acutiuscule marginata ; abdomine 

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

 sumnio, scapo subtus, capitis et pleurarum maculis, pronoti margini- 

 bus, tegulis, puuetis 2 scutelli; post-scutello, metanoti angulis, abdo- 

 minis seginentoruui 2-5 'margine, primi utrinque macula, auo, tibiis 

 tarsisque, flavis ; alis subferrugineis apice griseis. £ . 



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



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



?. 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, tegulas, two spots or the scutel, 

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

 the abdomen regularly and rather widely margined with yellow ; 



