188 HYMENOPTERA OF AMERICA. [PART I. 



scutello. tegulis, abdorainisque segmentorum 1', 2' margine, albidis; alis 

 vix infumatis. — %. Clypeo albido truucato. 



Odynerus pilosus Saoss. Et. Vespides, III, 218, 111 (1854). 

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



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

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

 Mi ax not i I ■■rated in the form of a wide cavity, but of a wide 



channel. 



29. A. Aristae Saitss. — Medius, uiger, argenteo-sericeus ; puncto fro n tali 

 et post-oculari flavo; tborace punctate; pronoto vaide biangulato, in 

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

 abdomine band sessili. primo segmento late infundibuliformi sntura 

 angnlata, secundo ventricoso, margine maxime canaiiculato, rugoso et 

 reilexo : segmentis omnibus flavo-marginatis ; alis ferrugineis. — % . 

 Clypeo flavo, bidentato; antennis subtus ferrugineis, scapo flavo-fasciato. 



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



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



Size moderate. Form wide, stubbed. Prothorax armed on 

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

 ii)i. 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 

 iuferior 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 .-'I toward its hinder part, and cribrose with rugose 

 punctures in its strung flutings ; the following segments having 

 the borders punctured., especially in the middle. 



Insect black; all its body covered with a beautiful silvery 

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



