340 HYMENOPTERA OF AMERICA. [PART I. 



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

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

 ? not as coarsely punctured and bicarinate ; size somewhat 

 larger, etc. 



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

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



Hab. Mexico. I caught several ? % in the temperate terrace 

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



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

 with yellow. (Insects often velvety.) 



13S. O. Huastecus Sauss.— Crassiusealus, fulvo-velutinns, densis- 

 sirae punctatus, metanoto argentato, minus distincte punctato quam 

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

 antico et postico, macula subalari, post-scutelli fascia, metanoti cantliis 

 abdominisque segmentorum limbo, fulvis ; 2 1 segment! margine et tertio 

 grosse punctatis; tibiis antice fulvis; alis subfuscescentibus, tegulis 

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

 ment! margine paulum reflexo.— Variat. $. Clypeo et metathorace 

 nigris. — £ . Antennis subtus fulvis. 



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

 Odyn. sobrinus Sacss., Ibid., 278, % (var.). 



Total length, 11 mm. ; wing, 8 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-velntinous with fulvous reflections, densely 

 but 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. 



