ODYNERUS. 19:"> 



2. Form very slender. Metathorax not so distinctly produced 

 behind the posi-scutel ; its concavity targe, limits 'rather 

 well defined. First abdominal segment elongate, bell-shaped, 

 having a distinct suture. 



(Group of 0. histrio.) 



A. *First segment of the abdomen rather funnel-shaped or bell- 

 shaped, truncate anteriorly. 



32. A. Fariasi Sauss. — Sat minutus, gracilis, foraminato-punctatus ; 

 proiioto bidentato, metathoraci.s foveola grosse punctata, angulata ; ab- 

 dominis priuio segmeiito infundibuliformi, basi truncato, secundo 

 angustiore ; antennis et tarsis subtus ferrugineis ; pronoti marginibua 

 tenuissime albido-limbatis, post-scutelli limbo antico, macula subalari, 

 lineolis 2 in metanoti canthis abdoininisque vittis 2, albidis. — £ . Cly- 

 peo albido, elougato, bidentato. 



Odynerus Farias Sauss. Rev. de Zool., 1857, IX, 274. 



£ % . Total length, 11 nun. , wing, 8 mm. 



9. Slender, lengthened. Head densely cribrose with great 

 punctures. Clypeus bearing some great shallow punctures, 

 strongly bicarinate toward the bottom. An impressed point on 

 the vertex. Thorax smooth, cribrose, with holes slightly sepa- 

 rated ; metathorax rugose above. Prothorax scarcely retracted 

 before ; its anterior border concave ; its angles spiniform. 

 Metathorax retracted and slightly prolonged behind the post- 

 scutel, then truncate; its posterior plate forming rather a 

 truncation than a concavity ; this plate a little triangular ; 

 widened at the summit, retracted below, its form sharply defined, 

 although with little or no border; having its latero-inferior 

 borders armed with a trenchant edge directed backward, ami which 

 terminates inferiorlyin two strong teeth between which fits the 

 base of the abdomen; the contour of the cavity ungulate, forming 

 on each side a sharp angle, but which is not detached in the form 

 of a tooth; the summit of the plate cribrose with great punc- 

 tures, but the lower portion is excavated into a striate furrow. 

 punctured, and divided by a vertical carina. The whole plate 

 denned in a manner comparable to a. double pentagon, character- 

 istic of tin 1 Ancislroccrns, properly called (cQtnp. p. 157, ex. 0, 

 eapra), but here the pentagon is lengthened, higher than wide. 

 Abdomen lengthened, the first segment prolonged, bell-shaped, 



