193 HYMENOPTKRA OF AMEB1 . [PAJIT T. 



1. Form length zonlallybe) 



". the?i truncal ring ah 



'ear of tl posts avity Urn 



vertical plate d F -abdo- 



minal segment entirely sesi nteate 



a shat~j 

 e$ ecially in the middle. Vertex of the 

 \g two little mammae filled with hair. Males 

 nearly as large as the females. 1 



(Group of the 0. quadrisectus.) 



(Sauss. " Z. p. 145. Sec:. 21. — Division Pscudodjn^.ru-. 



Ibid. III. i_ 



30. A. Aztecus Sauss. — G: --r, nitidos, _ ::>raminato- 



pnnctatus; T-rtice arcubas duol - | illatis instructo ; metanoto 



pon- - Ltellmn prodncto, postice foveolato. superne cristnlaui per 

 fissnrara di visam ferente ; abdomine dense pnnctato ; antennis subtns 

 ferrugineis. scapo flavo-lineato ; mandibuiis. tibiis anticis, puncto fron- 

 tali ; clvpeo J lineoiis 4, £ omnino. pronoti et abi. seginentoruni 1. 2 

 margine. post-scutello, macula subalari, metanoti punctis 6, et primi 

 rmenti puncto utrinque, luteis ; alis infuscatis violaceis. 



Odynerus At Sauss. Revue de Zool., 1857, 275. 



Total length, 15 mm. ; wing. 15 mm. 



9. A species closely allied to the 0. ±-stcfus. having the same 

 form, but smaller. Clypeus pyriform, very coarsely punctured, 

 with a depressed point, and carrying toward the apex a vertical 

 groove. Head and thorax polished, cribrose with great holes. 

 On th :. behind the ocelli, one sees two tubercles of brown 



hair: or a double bush of hair surrounding a smooth space. 

 Anterior border of the prothorax slightly concave : its angles 

 sharp. Metathorax not retracted behind : its superior face 

 cribrose with strong punctures like the remainder of the thorax. 

 Its concavity smooth, excavated, finely punctured, with blunted 

 borders, except at its superior extremity, where it is terminated 

 by a little vertical plate. Abdomen quite slender: its first seg- 



1 In the third volume of my Etudes sur hi Fain, de Vespides, p. 22 I 

 have placed in this Division the 0. luctuosus, but it would be better placed 

 in the Subgenus Odynerus. (See below the corresp i :;n formed 



by this species ) 



