188 nYMENOPTERA OF AMERICA. [PART I. 



scutello, tegulis, abdominisque segmentorum V, 2' niargine, albidis ; alis 

 vix infnmatis. — % . Clypeo albido truucato. 



Odynerus pilosus Sauss. Et. Vespides, III, 218, 111 (1S54). 

 Uab. Peru. (Type in the museum of Paris.) 



c. Abdomen not as sessile; its first segment narrowed, distinctly narrower than 

 the second, which is in the shape of a hawk's bell, with a reflexed margin. 

 Metathorax not excavated in the form of a wide cavity, but of a wide 

 channel. 



29. A. Aristae Sauss. — Medius, niger, argenteo-sericeus ; puncto frontali 

 et post-oculari flavo ; tborace pnnctato ; pronoto valde biangulato, iu 

 medio flavo-notato ; metanoto convexo, in medio canaliculato-diviso ; 

 abdomine baud sessili, primo segmento late infundibuliformi sutura 

 angulata, seeundo ventricoso, margine maxime canaliculato, rugoso et 

 reflexo ; segmentis omnibus flavo-marginatis ; alis ferrugineis. — %. 

 Clypeo flavo, bidentato ; anteunis subtus ferrugineis, scapo fiavo-fasciato. 



Odynerus Aristce Sauss. Revue Zool., IX, 1857, 274. 



% . Total lengtb, 12 mm. ; wing, 10 mm. 



Size moderate. Form wide, stubbed. Prothorax armed on 

 each side with a strong tooth, its anterior border wade and turned 

 up. Post-scutel blunt. Metathorax forming two convexities, 

 swelled, separated by a profound striate furrow, which is divided 

 by a vertical carina; the convexities bordered exteriorly by the 

 lateral edge of the metathorax which is prolonged as far as its 

 inferior extremity. Abdomen quite misshaped; the first segment 

 widely bell-shaped, the suture very distinct, not being straight, 

 but forming in the middle an angle directed backward ; its 

 superior face short and wide, the posterior border formed by a 

 cordon, along which is a line of punctures. Second segment 

 widened and a little retracted posteriorly in the form of a hawk's 

 bell; its posterior border very strongly canaliculate, very strongly 

 upturned, undulating in the middle. Head densely, thorax more 

 strongly but less densely punctured. First segment of the 

 abdomen slightly punctured near its border; the second segment 

 very much so toward its hinder part, and cribrose with rugose 

 punctures in its strong flutings ; the following segments having 

 the borders puncturecj, especially in the middle. 



Insect black; all its body covered with a beautiful silvery 

 velvet pile, above all on the abdomen which has beautiful reflec- 



