ODYNERUS. 35] 



as strongly punctured, and very distinct by its metathorax being 

 more flattened and produced posteriorly, and by its long second 

 abd. segment, with an arcuate edge. Jt is also much smaller 

 than the last. 



Hab. 1 caught only males in the valley of Mexico, near 

 Tacubaya. 



146. O. priiiwosus Smith.— Niger, sericeus ; capite, tliorace et abd. 

 lo segmento valde punctatis ; fascia clypei summi, puncto frontali et 

 post-oculari, pronoti margin e antico, macula subalari, tegulis parti m, 

 post-scutello, metanoti canthis, abdominisque fasciis 2, albidis ; pedibus 

 1°, 2° albido variis ; alis subhyalinis. £ . 



Odijn. pruinosus Smith, Cat. Brit. Mus., Vesp., 79, 200, J. 

 Length, 6 lin. 



9 . Black ; in certain lights, covered with fine silvery pile ; the 

 metathorax truncate, slightly concave, with a central impressed 

 line, on each side of which it is obliquely striate ; a stripe at the 

 base of the clypens, a minute spot between the antennae, and 

 another behind the eyes, white ; the head, thorax, and base of 

 the abdomen strongly punctured ; the anterior margin of the pro- 

 thorax, a spot beneath the wings, the anterior and posterior 

 margins of the tegulse, a spot behind them, the post-scutellum 

 and lateral margins of metathorax, a spot on the apex of anterior 

 femora behind, and the anterior and intermediate tibiae outside, 

 white; the 1st and 2d segments of the abdomen with white 

 fasciae on their apical margins ; that on the second continued 

 beneath. Wings hyaline, with their margins clouded. 



Hab. St. Domingo. 



The peculiar forms of this species not being very fully indi- 

 cated, I cannot be certain of its position. 1 place it near to 

 0. totonacus, to which it is allied by its livery, which is an indica- 

 tion of the group. 



Here probably comes the position of two species of which I 

 have no longer the types under my eyes, and which are not 



described with sufficient detail. 



14Y. O. Hiuro Sauss. 1 — Parvulus, elongatus, graoilis, rngosus, niger ; 

 clypeo disco'i'dali, subbidentato ; pronoto elongato, grosse punctato ; 



1 Perhaps thia might figure better in the Bubaeotion o( 0. /> - 



perennis, etc. ? 



