206 IIYMENOPTERA OF AMERICA. [PART I. 



3. Form sh rider, but the abdomen sometime* slender, sometimes 

 ovoid, especially among (he %. The first segment cupuli- 

 form, narrower than the 2d, tiering the sutu?-e indistinct, 

 often presenting a transverse jiuting bordered by two traces 

 of sutures} Concavity of the metaihorax generally small, 

 its borders indistinct. 



(Group of the 0. occidental is.) 



The insects of this category offer at times two sutural lines on 

 the first segment of the abdomen (the second usually interrupted) 

 so that oik, 1 feels the need of classing them in my Division Sub- 

 ancistrocerus (Vespides, III, 206; I, 126). Bat as all their 

 affinities lend toward the group of the 0. fulvipes, I think best 

 to leave them in t he same division. The sutures become wholly 

 double iu certain species or indistinct, so that one does not know 

 whether or not to take them for simple rugosities and class the 

 insects which carry them in the subgenus Odgnerus (Division 

 Stenodynerus). 



a. Suture of thef-st abdominal segment rather strong; excavation of the 

 metaihorax somewhat distinctly margined. 



41. A. Ciiliziliaiii Sacss. — Parvulus, niger, dense cribratus ; pro- 

 noto bidentato; metanoto perrngoso, foveola orbicular] punctata, sub- 

 marginata instructo ; abdomine valde punctato ; piirao segmento bisu- 

 turato ; secundi margine maxime cribrato, subcanaliculato; prothoracis 

 segmentorumque 1', 2' limbo, post-scutello, puueto frontali et frequenter 

 subalari, flavis ; pedibus fulvo-variis; tegulis maxiinis, ftavo-marginatis. 



Odynerus Guzmani S.vrss. Rev. de Zool.. IX, 1S57, 275, £ . 



Total length, 7 mm. ; wing, 6 mm. 



% . Small. Prothorax wide; its anterior border concave, 

 turned up, funning on each side a little tooth directed obliquely 

 forward. I bad and thorax before coarsely cribrose throughout. 

 Scute) divided by a groove. Metathorax feebly prolonged behind 

 the post-scutel, then vertically truncate, extremely rugose; its 

 noddle occupied by a circular concavity, shining and cribrose 

 with punctures; a little rimmed, especially at the summit. First 



1 Sometimes the two sutures an; feeble and difficult to distinguish. It 

 is necessary in that case to turn the insect into the proper light to per- 

 ceive thein. 



