ETJMENES. 65 



tip. Thorax rather square shaped anteriorly, not margined. 

 Petiole campanulate, rather short ; its dilatation broad, swollen 

 superiorly; the longitudinal channel quite obsolete, only distinct 

 on the anterior part of the dilatation. The rest of the abdomen 

 depressed. 



The whole body very smooth; head and thorax very finely 

 punctured, covered with a fine fulvous silky pubescence. Man- 

 dibles, flagellum of the antennae, fore legs beneath, posterior 

 margin of the prothorax and wing.scales, ferruginous; the borders 

 of the abdominal segments often brownish or ferruginous. Wings 

 transparent-ferruginous with brown nervures; their apical part 

 griseous. 



Var. a. Legs, knees, etc., rather ferruginous. 



b. Abdomen quite black. 



c. A little ferruginous spot under the wing ; two dots on base 

 of antennae. 



d. An interrupted ferruginous line on the post-scutel and two 

 obsolete lines on the rnesothorax. 



e. Metathorax and scutels marked with ferruginous (obacura 

 Smith). 



f. The general Color brownish. 



cj. The emargination of the clypeus more or less pronounced ; 

 the clypeus not bidcntate, only a little emarginate at tip. 



h. A yellow mark on each side of the clypeus. 



Reus. a. diff. — This species much resembles E. ater, but the 

 thorax seems to be shorter and thicker. It differs from Aztecus 

 by its shorter petiole, of which the dilation is more triangular, 

 less elongate, and by its clypeus destitute of spines. Compare 

 E. ater. 



JIab. The temperate parts of Mexico. Orizaba. G ?. 



"V. E. ater Sauss. — Niger, obscure-serioans ; clypeo bidentato, sulfuwo- 

 marginato; orbitis partim, post-scutelli fascia interrupts et petioli 

 margine, sulfureis vel ferrugineis. — £ tibiis flavo-variis. 



Pachymenes atra Sauss. Vespides, I, 75, 2; III, 153. 



Total length, 20 mill. : wing, 16 mill. 



Form nearly as in K. obscurvs ; clypeus bidentate in the same 

 way; the same punctuation, but a little smaller in size. The 



metathorax clot hod with gray pile. The petiole not quite so 



f3 



