218 IIYMENOPTERA OF AMERICA. [PART I. 



Description of the species. 



I. First segment of the abdomen bdl-s/iajied, not offering two 

 faces separated by a ridge, but pyriform, uniformly a little 

 comb-shaped. Appearance of AIontezumia. 



These insects can also nearly figure in the genus Nortonia, but 

 the concave form of the nietathorax brings it rather nearer to the 

 Odynerus of this Division. 



41, O. Tapiensis Sauss. — Omnino niger ; capite et thorace punctatis 

 velutinis, nigro-hirsutis ; thorace depresso ; metathorace utrinque later- 

 aliter, superne, valde carinato, et in foveola velutino; abdoinine nitido 

 depresso, primo seginento infundibuliforrni ; pedibus rufis, basi nigris; 

 alis nigro-chalybaeis. 9?. — % . Clypeo argentato, bideutato, fernoribus 

 interinediis subtus in medio dilatatis, basi excisis. 



Odynerus Tapiensis Sauss. Revue de Zool., XXII, 1870, 56, 5 £ . 



Total length, 20 mm. ; wing, 17 mm. 



%. Fades of a Montezumia. Mandibles slender and styli- 

 form. Ocelli large, disposed in a very wide triangle. Thorax 

 wide and strongly depressed. Prothorax widely truncate and a 

 little turned up. Post-scutel not truncate. Metathorax having 

 its lateral ridges very salient and trenchant toward the summit ; 

 its posterior face triangular, widening upward; the concavity 

 quite plain, but rugose and velvety ; its superior ridges not dis- 

 tinct, Abdomen wide and depressed ; the first segment pyriform 

 bell-shaped, depressed, subpediculate at its base and posteriorly 

 divided by a strong groove ; the 2d segment depressed, almost 

 discoidal ; offering beneath, at its base, an elevated wrinkle. 



Insect of a deep black; head and thorax densely punctured 

 and velvety; strongly pilose, woolly and bristling with long black 

 hairs. Abdomen smooth, shining, "woolly at its base. Legs 

 ferruginous with the base black. Wings black, with violet or 

 greenish reflections. 



%. Clypeus almost as wide as long, polygonal, clothed -with 

 silvery hair, arched in its superior moiety; its latero-inferior 

 borders a little concave ; its extremity terminated by two spini- 

 form teeth, between which is an arcuate notch. Antenna) strong; 

 the first article short, large, and arcuate; those following, strongly 

 pronounced, the articulations almost nodulose above; the last 

 article forming a large compressed and arcuate hook. Thighs of 



