North American Hymenoptera. 



375 



canna 



ginate antennae. It iS much smaller than the Ji^ 

 and its abdomen is formed as in that species. 



OxYBELus, Latr. 



t^ 



•Wf 



1. O. emargindtas* 



^ Black ;.scutellar spine emar- 

 ginate ; tergum 4-spotted. 



Inhab. Indiana. 



Body black, with a slight silvery reflection, particularly 

 on the anterior part of the head : antenna, dull yellowish 

 at tip : wing-scale honey-yellow : lidngs hyaline : sculel 

 with a dilated process widely emarginate at tip, and a 

 lateral sublanceolate, decurved, acute, white one : tergum, 

 first segment with a longitudinal, indented line and a 

 transverse, abbreviated, white line at tip each side ; 



i 



second segment also with a similar line : tarsi pale honey- 

 yellow : anterior thighs yellow at tip : tibice yellow ; 

 posterior pair black, yellow at base. 



Length over three twentieths of an inch. 



2. O. 4-notdtus, Nob. Long's Expedition. 



The male is almost destitute of spots on the second 

 segment of the tergum, and all the tibia? have a white 

 line. 



This species resembles the O. irispindsvs, Fabr. but 

 that insect may be distinguished by the dilated figure of 

 the spot on the basal segment of the tergum and by the 

 tibies, being entirely honey-yellow. 



3. O. IcBtus. Line on the collar, on the scutel and 

 five lateral spots on the tergum yellow. 



Inhab. Indiana. 



«k^ 



■> 



$ Body black, punctured : head with a slight silvery 

 reflection : antenna ferruginous : mandibles yellow, pice- 



