108 HTMENOPTERA OF AMERICA. [PART I. 



Var. a. Wholly ferruginous, with the wings obscure. 

 b. Abdomen black, with the end ferruginous ; petiole ferrugi- 

 nous, with a black margin. 

 Hab. South America. 



51. E. Orbignyi Sauss. 



Eumenes Orbignyi Sacss. Etudes sur la Fam. Vespides, I. 69, 57 (1S52). 



Hah. Bolivia. Probably a variety of the preceding. 



52. E. C'halicodoma? n. =p. — Niger; capite et tborace ferrugiueis, 

 fronte et nit-souoto nigi is ; tuberculis 2 obsoletis ferrngineis in f route ; 

 clvpeo lato, einarginato ; abdoininr fere impunctato ; petiolo niedioeri, 

 lsBvi, vix sulcato, apice puncto impiesio et maigine llavo ; alis infus- 

 catis. J. 



Total length, 15-20 mm. ; wing, 12-16 mm. 



?. Head orbicular, longer than wide. Clypeus large, widely 

 but not deeply emarginate at its inferior border and a little bicari- 

 nate ; the carina? distant. Between the antenna? an elongate 

 tubercle parted by a sulcosity. and over this, next to the top of 

 the eyes, two frontal rounded tubercles; vertex arcuate. Thorax 

 elongate, compressed, anteriorly margined by a feeble crest. 

 Scutel convex, parted by a groove ; metathorax parted by a 

 channel, nearly to the top. Head and thorax delicately punctate. 

 Disk of mesothorax with two or four sulcosities at base. Petiole 

 moderate, polished, impunctate. as long as the thorax, a little 

 gibbous in the middle ; its sulcosity very obsolete ; the end 

 without elevated margin, but with an impressed point. The rest 

 of the abdomen elongate, pear-shaped, not compressed, nearly 

 impunctate, except along the edge of the margins ; the second 

 edge obsoletely separated from the first. 



Head ferruginous ; the forehead black, with its three tubercles 

 ferruginous; antennae ferruginous; the flagellum black above. 

 Thorax ferruginous, beneath and in the grooves of the sides, 

 black; disk cf mesothorax black. Abdomen black: the petiole 

 margined with yellow. Feet ferruginous, varied with fuscous. 

 Wings washed with brown ; the costa more obscure. 



Bess. a. diff. — Xearly of the same coloration as E. conaJicu- 

 latus, but smaller; the head less broad, not so triangular, distinct 

 by its two frontal feeble tubercles; the thorax much narrower, 

 more margined anteriorly, more canaliculate posteriorly ; the 



