EUMENES. 15 



flat, a little truncate, or sub-emargiiiate. The head a little more 

 unequal; the grooves of the antenna? stronger, etc. The thorax 

 not quite so large nor so cubic anteriorly ; the disk of the meso- 

 thorax somewhat gibbous, having two longitudinal carina? in the 

 middle and on each side before a sort of sinking or excavation, 

 behind which is an eminence next to the wing scale; two sulco- 

 sities continue the excavation up to the scutel ; the scutellum 

 oblique, parted by a groove ; the metathorax still more divided 

 by a groove. The thorax covered with strong, rather scattered 

 punctures; on the metathorax not so strong Abdomen polished, 

 not punctured, or only indistinctly ; petiole more elongate, not 

 so broad, behind more pyriform-truncate than triangular, not 

 much inflated. 



Black, with a fulvo-sericeus pile. End of mandibles, antenna? 

 beneath, a frontal spot, a line behind the eyes, and a spot in their 

 emargination, dull ferruginous. Both borders of prothorax, 

 tegulae, post-tcgula?, scutels, and sides of the abdomen, obscure 

 ferruginous; border of petiole with a yellow margin; the other 

 segments with an obscure ferruginous marginal band ; that of 

 the third and following segments twice notched. Feet ferrugi- 

 nous, black at base. Wings cloudy, nerves blackish. 



£ . A little smaller, but quite identical with the female. The 

 clypeus might be a little more bidentate ; the hook of antenna? 

 small, blackish. 



Var. a. Antenna?, prothorax, and mesopleura? more or less 

 ferruginous. 



h. The disk of mesothorax not bicarinate. 



Bess. a. diff. — This species is very much like E. aviculus, having 

 nearly the same coloration, but differs principally by its not 

 strongly punctate abdomen, and narrower, longer petiole. It is 

 easy to distinguish from all neighboring species by its deformed 

 mesothorax ; in other tilings quite close to E regulvs. 



Hab. Mexico. Oriental Cordillera. (20 9,3 %, Mr. Sumi- 

 chrast.) 



B. Tliorax a little longer than wide. TJie 2d segment of abdo- 

 men sometimes rather elongate. 



15. E. Mexicaeilis. (Fig. 8, 8a.) — Sat miiintus, nicrer, dense punc- 

 tatus ; scutello crassins crihrato; clypeo piano, nitido, apice bispinofo; 

 Utrinque antennis subtus et pronoti margine antico, ferrugineis, puncto 



