64 HYMENOPTERA OF AMERICA. [PART I. 



5. E. oliraceus n. sp.— Olivaceo-fuscus, clypeo valde bideutato, apice 

 flavo-testaceo; thorace aureo-sericeo, antice quadrato, metanoto saperne 



bicarinato ; petiolo tuniido sulco parti to; antennis subtus, tegulis et 

 tarsi s, ferrugineis ; orbitarum maculis fascia interrnpta post-scutelli 

 tibiisqne extus testaceis ; alis diaphanis, ferrugineis. J. 



Total length, 20 mill. ; wing, 15 mill. 



Brown-chocolate or olive. Head and antennae blackish. Head 

 and thorax very delicately punctured, sericeous; prothorax broad 

 and square ; metathorax narrower, short, having in its superior 

 part two carinae which start nearly from the angles of the post- 

 scutel The whole thorax with a golden reflection, velutinous 

 principally on the metathorax. Petiole pyriforni-campanular, 

 swelled above, parted by a delicate groove, bordered by a cordon 

 preceded by a transverse groove. The rest of the abdomen 

 depressed — pear-shaped; the 2d segment rather elongate. 



Antennae ferruginous beneath, principally at the extremity; 

 wing scales and tarsi ferruginous. Mandibles, a line behind each 

 eye, and often the inner orbits testaceous. Tibiae, knees, and 

 coxae varied with pale yellow ; an interrupted line of this color 

 margining the post-scutel. Borders of prothorax often ferrugi- 

 nous onwith golden reflections. Wings transparent, ferruginous. 



?. Clypeus oval, black, scarcely punctate, ending with two 

 carinae in two long teeth, separated by a triangular notch ; its 

 extremity and inferior margins yellow-testaceous. 



Bess. a. cliff. — This species much resembles E. obscurus and 

 ater, but differs by its metathoracic carinae. It differs from E. 

 brunneus by its scrolled, swelled, and bordered petiole. 



Hab. Surinam. This species has been communicated to me 

 by Capt. Yon Heyden from the Senkenberg Museum at Frank- 

 furt (Germany). 



6. E. ol)SClirils Smith. — Validus, niger, sericeus ; clypeo apice biden- 

 tato ; mandibulis, flagello, pedibus anticis subtus, pronoti inargiue 

 postico tegulisque, ferrugineis; alis byalino-ferrugineis. £. 



Pachymenes obscura Smith, Cat. Brit. Mns. Vespid., 34, 7 (1657). 



Total length, 22 mill. ; wing, 18 mm. 



9 . Black. Clypeus pyriform, having a triangular notch at its 

 extremity, and bidentate ; often two little carinae terminating in 

 the apical teeth. Mandibles long, slender, a little arcuated at 



