ODYNERUS. 233 



% . Clypeo polygonali, late truncato, margine utrinque flavo, vel omnino 

 flavo, macula uigra. 



Odyn. nasidens Latr. Voyage de Humboldt, Zool. II, 112, pi. xl, fig. 1, 2, 

 $>.— Sauss. Vespides, I, 171, 61, 1852; III, 230.— Rev. Zool. X, 1858, 

 105, 1. — Packard Hep. Peabody Acad. 1869, 5. 



Odyn. auratus Sauss. Rev. Zool. X, 1858, 166. 



Odyn. brevithorax Sacss. Vespides, I, pi. xvii, fig. 9, J .' 



J. Total length, 13 mm. ; wing, 11 mm. 

 % . Total length, 10 mm. ; wing, 7.5 mm. 

 Var. minor. — 9. Total length, 10 mm.; wing, 7.5 mm. 

 £ . Total length, 7 mm. ; wing, 6.5 mm. 



Of variable size, sometimes larger than the 0. brevilhorax, 

 sometimes of the same size. Head densely punctured. Thorax 

 longer than wide, densely cribrose ; post-scutel linear above, 

 finely crenulate, meta thorax very squarely truncate; its concavity 

 occupies the whole width, is smooth, silky, and a little striate, 

 bordered above by some arcuate, very trenchant ridges, which 

 abut upon the two extremities of the post-scutel within, but 

 which are not as well separated from it by fissures as the 0. 

 brevilhorax ; from each side a dentiform angle turns downward. 

 Abdomen perfectly conical; the first segment very large; quite 

 long, being notably more so than in the 0. brevilhorax, where it 

 only forms a cup, not a bell. 



Insect black, clothed in a beautiful velvet, of silky hair, having 

 golden reflections, which are only distinct among the well-pre- 

 served specimens. Mandibles ferruginous at the end, spotted with 

 yellow at the base. Two spots at the extremity of the clypeus 

 and one at the extremity of the scape, post-scutel, ridges of the 

 metathorax, and a regular border upon segments 2-5 of the 

 abdomen of a yellow-ochre, a little golden ; border of these 

 segments strongly punctured ; anus bordered with yellow ; wing 

 scales marked or bordered with testaceous; knees and end of tarsi 

 a little ferruginous ; anterior tibiae marked with yellow before. 

 Wings ferruginous with the end gray. 



?. Clypeus pyriform, rugose, strigose-punctate, terminated by 

 two diverging or biangulate teeth. 



Var. a. Clypeus yellow, or margined with yellow, or with two 

 yellow spots on the top. 



b. A yellow line on the scape. 



1 Only the figure, not the description. 



