North American Hymenoptefa. 253 



4. B, dorsator. Yellowish; antennae, three thoracic 

 lines and tip of the tergum, black. 



Inhabits Indiana. 

 , Body yellowish; somewhat fulvous, a little polished: 

 antenna short; rather robust, black ; area of the stemmata 

 blackish : thorax with three distant black, short lines, the 

 anterior one shortest and impressed : wings hyaline, 

 slightly dusky towards the base ; cellules regular ; nerv- 

 ures brownish ; stigma triangular; yellow-brown : tergum 

 with a black dot on the first segment, and dusky on the 

 disk or towards the tip : jpleura with a blackish line be- 

 hind the wing : peclm blackish on the disk : feet with 

 the tarsi dusky at tip. 



$ Oviduct half as long as the abdomen. 



Length to the tip of the wings less than three twen- 

 tieths of an inch. 



Much like Jiehetar^ but is somewhat larger and more 

 robust ; it may be distinguished at first by its lighter 

 color. As in that species the first cubital cellule is wider 

 by one third than the second at their junction, and the 

 latter is hardly as long as the first, in either sex. 



5. B. arguiator. Honey-yellow j antenna, terminal 

 joint of the tarsi and oviduct, black- 

 Inhabits Indiana. 



9 Body honey-yellow, somewhat polished : antennce 

 black : mandibles piceous : hypostoma with a transverse, 

 dilated indentation : stemmata blackish : thorax immacu- 

 late : wings very shghtly tinged with dusky ; nervures 

 blackish ; stigma yellowish in the middle; second cubital 

 cellule as long or rather longer than the first, and nearly 

 as wide at their junction : tergum of a rather paler yel- 

 low than the thorax, and opake with minute punctures or 

 granules, oblong-oval : oviduct black, half as long as the 

 abdomen : tarsi^ terminal joint blackish. 



