ODYNERUS. 209 



b. Sulure of thejirst abdominal segment not so strong. Excavation of meta- 

 thorax having its edges rounded, without precise limits. 



44. A. SumiclirastiSAUss. J. — Gracilis, niger, grosse forauiinato-crib- 

 ratus; at inetanoto paruiu punetato, haud rugoso, foveola parvula rotun- 

 data, haud marginata, post-scutel 1 urn attiugente, instructo ; abdouiiue 

 valde punetato ; priuio segmento utrinque ad suturaui paruia perspicuam 

 subcanaliculato ; antennarum scapo subtus et pedibus partim, ferrugi- 

 neis ; puueto mandibulaiuni, frontis,summiclypei et post-oculari, fulvis ; ■ 

 post-scutelli fascia flava ; abdominis seguieutis omnibus late flavo- 

 marginatis. 9 • 



Odynerus Sumichrasti Sadss. Rev. de Zool., IX, 1S57, 275. 



Total length, 9 mm. ; wing, 7 mm. 



?. A species very near to the 0. huastecus. Clypeua a little 

 wider than long, bearing toward the bottom two salient carina} 

 which appear like two teeth, between which is a little slightly 

 arcuate border. Thorax lengthened. Angles of prothorax dis- 

 tinct. Metathorax offering very trenchant lateral ridges ; its 

 concavity small, rounded, punctate, and striate, without defined 

 borders, but extending as far as the post-scutel. Head and 

 thorax very densely, strongly, and regularly punctured ; the 

 metathorax being notably less strongly so; the same offering a 

 smooth space on each side of the post-scutel. Abdomen quite 

 lengthened, the first segment cupuliform, almost bell-shaped, quite 

 large, although smaller than the 2d, nearly as grossly punctured 

 as the thorax, but smooth at its base, and offering an irregular, 

 hardly sensible suture (especially visible when one regards the 

 insect from before), which is not formed by a crest, but which is 

 rather the result of the coarseness of the sculpture. Behind this 

 suture the segment is creased on each side by a groove which 

 makes a portion of the sculpture and of which the posterior border 

 figures as a second interrupted suture. Second segment a little 

 swelled above at its base, strongly punctured, above all toward 

 its posterior border, which is not channelled but bordered by a 

 light cordon. The following segments more finely punctured. 



Insect black, covered with a gray pile, especially on the meta- 

 thorax; a spot at the top of the mandibles, a dot at the summit 

 of clypeus, another on the front, another in the sinus of each eye, 

 and one behind the eyes, ferruginous ; these dots often wanting 

 14 



