G4 IIYMK.NnPTF.lt A OF AMERICA. [PART I. 



.5. K. olivaceus n. sp.— Olivaceo-fuscus, clypeo valde bidentato, apice 

 flavo-testaceo; thorace aureo-sericeo, antice quadrate-, metanoto superne 

 bicarinato; petiolo turaido sulco partite; antennis subtus, tegulis et 

 tarsis, ferrugineis ; orbitarum maculis fascia interrupts, post-scutelli 

 tibiisqae extas testaceis; alis diapbanis, ferrugiueis. J. 



Total lengtb, 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 carina; which start nearly from the angles of the post- 

 scutel The whole thorax with a golden reflection, velutinous 

 principally on the metathorax. Petiole pyriform-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, aline 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- 

 qous or with gulden reflections. Wings transparent, ferruginous. 



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

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

 extremity and inferior margins yellow-testaceous. 



//■ .--.>•. a. iliij. — This species much resembles E. obscurus and 

 ater, bul differs by its metathoracic carina'. It differs from E. 

 brunneus by its scrolled, swelled, and bordered petiole. 



I/ah. Surinam. This species has been communicated to me 

 ] <> Capt. Von Heyden from the Senkenberg Museum at Frank- 

 furt (Germany). 



«». E. obscurus Smith. — Validus, niger, sericeus; clypeo apice biden- 

 tato ; mandibulis, flagello, pedibua anticis subtus, pronoti margiue 

 postico tegulisque, ferrugiueis; alis hyalino-ferrugineis. J. 



Pachymenes obscura Smith, Gat. Brit. Mas. Vespid., 34, 7 (1857). 



Total lengtb, 22 mill. ; wing, IS mm. 



?. Black. Clypeus pyriforra, having a triangular notch at its 

 extremity, and bidentate ; often two little carina? terminating in 



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



