218 HYMENOPTERA OF AMERICA. [PART I. 



Description of the species. 



I. First segment of the abdomen bell-shaped, not offering hvo 

 faces separated by a ridge, but pyrifor'm, uniformly a little 

 comb-shaped. Appearance of Montezumia. 



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

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

 Odynerus of this Division. 



47. O. Tapiensis Sauss. — Oinuino niger ; capite et thorace punctatis 

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

 alittr, superne, valde carinato, et in foveola velutino; abdomine nilido 

 depresso, primo segmento iufundibuliformi ; pedibus rufis, basi uigris; 

 alis nigro-chaly basis. 9?. — %. Clypeo argentato, bideutato, femoribus 

 iutermediis subtus in medio dilatatis, basi excisis. 



Odynerus Tapiensis Sacss. Revue de Zool., XXII, 1S70, 56, 5 £. 



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



% . Facies 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 velvet)-; 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- 

 forni teeth, between which is an arcuate notch. Antennae 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 



