88 IIYMENOPTERA OF AMERICA. [PART I. 



in the strongly cribrose boss of the second abdominal segment. 

 It differs from E. mexicanus in its much larger size, in its less 

 strongly cribrose, less globular nietathorax. In fact, the form, 

 swelled and cribrose above, of the 2d abdominal segment, distin- 

 guishes the E. inf ernalis from all others of the Division Omicron. 

 This character is a transition to the Division Alpha, which con- 

 stitutes an exception in the Division Omicron. 



Hub. Brazil. Para. (Coll. Spinola.) Guiana. (Mus. of 

 Hamburg.) 



Division BETA. 



Mandibles rather hooked at end, or truncate. Head in form 

 of a transverse oval, not rounded-triangular ; the eyes very large 

 in their inferior part. Thorax not larger than the pear of the 

 abdomen, globular or cubic. Petiole elongate, filiform, cylindrical, 

 only very little dilated at the end in a funnel shape, 1 its posterior 

 border marked with an impressed point. The 2d segment not 

 depressed, not compressed. 



These insects slightl} 7- resemble in form the Pareumenes ; but 

 they are much more slender. The thorax has quite another 

 shape, not being widened and depressed, but cubic, more as in 

 Division Omicron, although smaller. The abdomen also is not 

 depressed, but the petiole quite recalls the form it has in Pareu- 

 menes, although much more slender. 



The mandibles are rather hooked, strongly dentate as in 

 Pachymenes, but by exception short and blunt (?) more as in 

 Zethus. 



This Division is intermediate between the Pareumenes and the 

 Eumenes of Division Omicron. 



a. Mandibles short, pointed in the males, blunt, rounded at tip, with separated 

 small teeth in the females. 



30. E. XortonianilS n. sp.^Niger, dense crassiuscule punctatns ; 

 oculis infere valde inflatis ; mandibulis brevibus, £ apice rotundatis ; 

 clypeo pentagonali, bidentulo ; carina frontali nulla; petiolo elongate, 

 filiformi, apice tenuiter, cylindrico-infundibuliformi, puncto apicali 

 iinpresso; abdomine dense punctato ; puncto frontali, niarginibus pro- 



1 Not campanulate, more pear-sbaped as in Division Alpha or Omicron, 

 but filiform, widened at end somewhat like a clarionet. Seen from above, 

 the sides of the petiole are not arcuate-convex but rather arcuatH-concave. 



