232 II Y MEN OFT ERA OF AMERICA. [PART I. 



vissimo; antennarum flagello subtus et scapo apice, ferrugineis ; tegulis 

 testaceo-maculatis ; abd. segmentoiura 2-5 uiargine late fiavo, et valde 

 punctato ; primo nonnunqnatn etiarn tenniter flavo-marginato; tibiis an- 

 ticeflavo velfulvo-variis; alis ferrugineis, apice griseis. — Longit. 10 mm. 



Variat. Metanoti canthis ilavis. 



5>. Clypeo punctato apice, dentibus 2 acntis, inter se distantilras armato; 

 punetis 2 fulvis in dentibus et 2 in angulis superioribus ornato. 



£ . Clypeo in marginibus argentato ; apice fere ut in 9 bidentato, vel 

 emarginato, dentibus 2 trigoualibus terminato; apice lineis 2, in summo 

 fasciis 2 lateralibus, flavis; labro liavo ; mandibulaium margine externo 

 et scapo, linea flava instructis. 



Variat. Clypeo in lateribus flavo-marginato; oculis intus flavo-marginatis, 

 pedibus nigris. 



Odjjnerus brevithorax Sauss. Vespides, I, 172, 62' (1852); III, 231.— 

 Rev. Zool. X, 1858, 166. 



The teeth of the clypeus 9 ore spiniform and separated by an 

 arched margin, not angularly notched. The thorax is cubical, 

 not longer than wide ; the disk of metathorax is much broader 

 than long-, in the form of a half circle ; its margins are arcuated 

 anteriorly, not sinuated. The scutel is square, rather elevated, 

 and the post-scutel is situated a little lower, while in auratua, 

 the scutel is more flattened and the post-scutel is on the same 

 plane. 



Bess. a. diff. — Compare 0. nasidens and simplicorms, 0. 

 diabolicus, and also Ancistrocerus Aristae and Paredesi. — This 

 species, as well as the following, must he carefully distinguished 

 from different species of Nectarinia; 2 this may easily be done, 

 from their very wide first abdominal segment, not very small and 

 shortly petiolate ; from their distinct post-scutel, and the truncate, 

 not angulate, apex of the clypeus. 



Hah. South America. Brazil. Bahia, 2 9,3 £. — Vene- 

 zuela 9 I. 



(JY. O. nasidens Latr. — 0. brevithoraci simillimus ; statura varia- 

 bilis tliorace longiore quam latiore; pronoti margine postico, post- 

 scutello, abdominisque segmentorum 2-(J margine ochraceis ; alis ferru- 

 gineis, apice griseis. 



9. Clypeo apice latins bidentato, magis biangulato ; dentibus fulvis; 

 inter. 1 urn snperne maculis 2 fulvis vel omnino flavis. 



1 Tbe figure which bears the same name belongs to the 0. nasidens. 



2 Social wasp. 



