ODYNERUS. 295 



crest of post-scutel insensibly bituberculate. Concavity of meta- 

 thorax quite small, the strias parted in the middle by a carina ; 

 its borders completely rounded and punctured, forming no trace 

 of a salient behind the post-scutel. Abdomen truncate anteriorly ; 

 second segment rather wider than long, a little wider than the 

 first; its border offering a wide impressed zone, roughly cribrose 

 with separate punctures, insensibly crenulate. Borders of the 

 other segments very coarsely punctured. 



Insect black, velvety, garnished with an abundant woolly, tawny 

 pile. Clypeus, mandibles, a spot on the front, and the complete 

 border of the orbits, as well as the vertex, ferruginous; one sees 

 beside on the vertex a transverse band of this color which joins 

 the summit of the two eyes. Antennae ferruginous, with their 

 second moiety black. Prothorax, tegulaa, a spot under the wing, 

 scutel and post-scutel, wholly or in part, and angles of metathorax, 

 of an obscure ferruginous ; there is often a ferruginous spot at 

 the base of mesothorax also. Abdomen silky or woolly, ferrugi- 

 nous, with the border of all the segments, yellow; the base of the 

 first two black, which forms variable designs. Legs ferruginous. 

 Wings ferruginous along the side, a little smoky in the rest of 

 their extent, the radial cellule obscure. 



Vai\ a. The little channel of second segment almost null in 

 certain specimens. 



b. Metathorax black; scutel black, with two red spots; the 

 black strongly extended on the first two segments of abdomen. 



c. The scape blackish above; vertex without red transverse 

 band ; legs black and yellow. 



d. Clypeus, ornaments of the head, scutel, tegulae, spots under 

 the wings, passing into yellow, 



9. Clypeus wide, strongly punctured, its inferior margin 

 truncate, the angles forming two little salients. 



% . Clypeus polygonal, truncation almost straight, yellow. 

 Post-scutel bidentate or 4-dentate, or denticulate ; 2d segment 

 very short, concave, its border very rugose, at times a little 

 channelled. Vertex generally black, bordering of orbits incom- 

 plete at the summit. 



Var. The first segment black, bordered with yellow ; the 

 bordering joining with two red lateral spots ; the 2d black, red 

 on the sides. 



Hess. a. diff. — This species has rather nearly the same colora- 



