338 HYMENOPTERA OF AMERICA. [PART I. 



The anterior edge of prothorax with a nearly complete submar- 

 ginal yellow band ; no spot under the wing ; the yellow band 

 of the 3d segment incomplete. The cavity of metathorax larger, 

 more limited superiorly. 



Var. o. Clypeus with its lower half black; metathorax black. 

 Ornaments of the head pale. 



Var. 9 %■ Flagellum slightly ferruginous beneath. Tegulas 

 blackish ; border of 3d segment w T anting, or incomplete or com- 

 plete. 



Ress. a. cliff. — A small species, rather distinct by the very 

 coarse punctures of the clypeus, the coloration of the male, the 

 colors of abdomen and coarse punctures of the first segment, and 

 its clothing more sericeous than velutinous. The coarse rugosi- 

 ties of metathorax must not cause it to be confused with 0. 

 otomitus; this is a velutinous insect not as small, with a different 

 livery and more angulate metathorax. 



Hab. Mexico. I caught 2 ?, 3 % near Cuautla, in the hot 

 part of the province of Mexico, and 1 % in the Mechoacan. 



136. O. Catepetlensis Sadss. — Minutus, niger, capite elevato; an- 

 tennis inferius insertis ; metathorace foveolato ; mandibulis apice 

 rufis ; clypei apice, puncto frontali et post-oeulari, inaculis 2 pronoti, 

 tegulis, puncto subalari post-scutelloque, flavis ; abdomine va!de punc- 

 tato, segmentis 1°, 2° fiavo-limbatis ; pedibus fulvis, basi nigris. Alis 

 subhyalinis in costa fusco-ferruginescentibus. — Long. 9 mm. — $? . An- 

 tennis nigris.— 'J,. Clypeo paulura bidentato, flavo; mandibulis antice 

 et scapo subtus flavis; flagello subtus ferrugineo. — Variat. signaturis 

 luteis. 

 Odyn. Catcpethmsis Sauss. Et. Vesp. Ill, 255, 132. 



I did not find this species in Mexico, and have not seen it again 

 since I described it. The type in Spinola's collection has been 

 destroyed. It seems to approach closely to 0. mystecus. 



Hab. Mexico. 



13*7. O. mayus Sauss. — Niger, cinereo-sericeus, flavo-mnltipictns ; 

 pronoto antice, post-scutelli fascia, abdominisque seginentorum margi- 

 nibus, ochraceo-flavis ; tibiis antice flavis; tegulis ferrugineis. — £. 

 Clypeo truncato, superne macula fulva. — % . Clypeo bidentato, vel sub- 

 bidentato, flavo; antennarum flagello subtus fulvo; pedibus partim 

 flavis. 

 Odyn. Maya Sacss. Revue de Zool. IX. 1857, 279. 



J . Total length, 9 mm. ; wing, G.S mm. 

 % . Total length, 8 mm. ; wing, 6 mm. 



