ODYNERUS. 173 



9. A species closely allied to the 0. Santa- Ann se,, having 

 exactly the same appearance and the same sculpture; the abdo- 

 men being- also of a deep velvety black. 



Olypeus wider than long, its anterior border truncate, straight, 

 or a, little concave, not bidentate. Thorax very short, sensibly 

 wider than with the species cited; the prothorax less angulate, 

 but very wide, the disk of the mesothorax wider than long; its 

 grooves indistinct ; metathorax a little retracted, so that the thorax 

 increases in width from behind forward. The posterior plate of 

 the metathorax a little striate, wider and less strongly bordered. 

 The yellow ornaments more abundant than in the preceding 

 species ; clypeus carrying four yellow spots, or yellow with the 

 scutellum black on the summit; scape of the antennse adorned 

 with a yellow line ; border of the prothorax very narrow. Thorax 

 with a spot beneath the wing, an interrupted band on the scutel- 

 lum, and with two spots upon the inferior edges of the metathorax. 

 Segments of the abdomen all regularly bordered with sulphur- 

 yellow ; the last ones very narrowly ; the first ones very short, 

 as wide as the second. Feet black, tarsi and tibia? ferruginous. 

 The remainder as with the 0. Santa-Annae. 



Var. Two yellow dots on the scutellum. 



% . Unknown. 



This species very much resembles the 0. Catskilli, but differs 

 from it by the very punctate border of the abdominal segments, 

 the first segment being also wider and shorter. 



JHab. The cold regions of Mexico. I have taken this Odynerus 

 upon the Coffre de Perote. 



IS. A. Sylveirae Sauss. 



Odynerus Sylveirce Sauss. Et. Vespides, III, 217, 110; pi. x, fig. 8, 9 

 (1S54). 



Eab. Brazil. Sylveird. (Type in the Paris Museum.) 



b. Metathorax having two strong spines. 



19. A. CBaraziatms Sauss. — Niger, sericeus; capite rnfo vel obscuro; 

 capite et thorace snperne rugose punctatis ; pronoti angulis emarginatis, 

 lobatis ; post-scutello valde cristato, emarginato ; metathorace postice 

 excavato, canthis peracutis rnarginato, utrinque spina et infere dente 

 armato ; antennis nigris ; pronoti margine postico, n acula subalari, 



