240 HYMENOPTERA OF AMERICA. [PART I. 



1st segment not widened on the sides, but on the contrary nar- 

 rowed; 2d segment without an impressed marginal hand; clypeus 

 9 not as coarsely punctured and bicarinate ; size somewhat 

 larger, etc. 



From 0. Victoriae it is distinguished by its shorter form, and 

 metathorax not so triangular, and antennae of % fulvous beneath. 



Bob. Mexico. I caught several 9 1 in the temperate terrace 

 of Cuernavaca, near Yautepec ; and in the valley of Alextitlan. 



c. Posterior margin of prothorax, and often also the anterior margin bordered 

 with yelloio. (Insects often velvety.) 



13§. O. Huastecus Sauss. — Crassinsculus, fulvo-velutinns, densis- 

 sime punctatiis, inetanoto argentato, minus distincte punctata quain 

 mesonotum ; clypeo apice et superne fulvo-maculato ; pronoti margine 

 antico et postico, macula snbalari, post-scutelli fascia, metanoti canthis 

 abdominisqae SHgmentorum limbo, fulvis ; 2' segmenti margine et tertio 

 grosse punctatis; tibiis antice fulvis; alis subfuscescentibus, tegulis 

 fulvo-marginatis. — % . Clypeo ovato, flavo-bidentato ; secun<li abd. seg- 

 menti margine paulum refiexo. — Variat. £. Clypeo et inetathorace 

 nigris. — % . Anteunis subtus fulvis. 



Odyn. Huastecus Sadss. Revue de Zool., IX, 1857, 278. 

 Odyn. sobrihus Sadss., Ibid., 278, % (var.). 



Total length, 11 mm. ; wing ; S mm. 



The size of 0. anormis. A little impression behind the ocelli. 

 Clypeus triangular, pyriform, coarsely punctured, truncate and 

 biangulate at tip. Prothorax upturned, subbiangulate. Head 

 and thorax densely punctured, velutinous; metathorax smoother; 

 its hinder face triangular; having a small concavity, finely strigate 

 and punctured, not margined ; superiorly terminated by a double 

 arch, but not ridged. The lateral edges (extending from the 

 hinder wing to the articulation of the abdomen), compressed and 

 sharp, covered with shining silvery hair. 



Abdomen ovoid; the first segment rather elongate, cup-shaped 

 or rather shortly convex funnel-shaped; the 2d rather in form 

 of a hawk's bell, constricted at base to fit into the first. The 

 whole abdomen silky-velutinous with fulvous reflections, densely 

 bnt a little less strongly punctured, than the thorax ; the second 

 segment not quite as strongly as the first ; its margin coarsely 

 punctured, with the edge very little reflexed ; the 3d not quite 

 so coarsely, the 4th finely, the 5th and 6th not at all punctured. 



