C6 HYMENOPTERA OF AMERICA. [PART I. 



much dilated posteriorly, having on its hinder part a very obso- 

 lete wide channel. The thorax shorter, more convex; the ante- 

 rior margin a little bordered. 



Black, with a fine sericeous reflection; flagellum of the antennae 

 beneath, principally at tip, ferruginous ; an interrupted line on 

 the post-scutel and on the hind margin of the petiole, yellow. 

 The cud of the femora and the tibiae a little tinged with yellow. 

 Wings ferruginous. 



?. The emargination and the lateral borders of the clypeus, a 

 line along the orbits inside and at top outside, sulphur-yellow ; 

 mandibles in part and the tarsi, ferruginous. 



Var. The mesopleuras marked with ferruginous ; the end of the 

 clypeus not yellow. Margin of segments brownish. 



% . Antennae terminated by a little brown hook. The yellow 

 ornaments of clypeus more extended. Mandibles black ; tibiae 

 with a yellow band. 



Var. No yellow border at the petiole. 



Bess. a. cliff. — This species differs from Olivaceus by its 

 metathorax, which is not carinated. 



Hab. Brazil. Rio Janeiro. 2 ? , 2 % . 



B. Petiole pyriform, depressed, less inflated above, not divided 

 by a groove. 



Se E. Santa-Anna. (Fig. 6, 6a.) — Niger, politus, vel punctulatus, 

 argenteo-sericeus,clypeo bidentato ; metanoto brevi, oonvexo, abdomine 

 depresso ; puncto frontali, pronoti margine postico, et antice fascia inter- 

 rnpta, scutelli margine, post-scutello, maculis subalaribus, et segmen- 

 torum abdominis 1, 2 limbo tibiariim^ue fascia, luteis ; alis fusco- 

 venosis. — Valde variabilis species. 



Eumenes Santa-Anna Sauss. Revue, et Mag. de Zoolog., IX, 1857, 272. 



Total length, 16 mill. ; wing, 11 mm. 



Of medium size. Body polished, nearly impunctate. Ocelli 

 arranged on an arcuate line. Clypeus bidentatc ; its teeth 

 spiniform. Thorax wide and quadrate before ; very slightly 

 bordered anteriorly; its angles a little rounded. Metathorax 

 short, convex, as among the true Eumenes, polished and punctate. 

 Abdomen much depressed. Petiole nearly of the length of the 

 thorax, campanulate, smooth, and shining, its posterior moiety 

 very wide and strongly depressed, its posterior border thickened 



