706 BOSTON JOURNAL 



rax with three distcant black, short Hues, the anterior one shortest 

 and impressed : wings hyaline, slightly dusky towards the base ; 

 cellules regular ; nervures brownish; stigma triangular, yellow- 

 brown : tergum with a black dot on the first segment, and dusky 

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

 hind the wing : pectus 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-twentieths of 

 an inch. 



Much like hehrtor, 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. ARGUTATOR. — Honcy-yellow ; antennaj, terminal joint 

 of the tarsi and oviduct, black. 



Inhabits Indiana. 



9 Body honey-yellow, somewhat polished : antennse black : 

 mandibles piceous : hypostoma with a transverse, dilated inden- 

 tation : stemmata blackish : thorax immaculate : wings very 

 slightly 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 yellow than the thorax, and opake with minute 

 punctures or granules, oblong-oval : oviduct black, half as long 

 as the abdomen : tarsi, terminal joint blackish. [254] 



Length to tip of wings over three-twentieths of an inch. 

 Of the same general habit with hchrtor, but is considerably 

 larger, and may be known at once apart from it, by the equality, 

 at their junction, of the 1st and 2d cubital cellules, by the punc- 

 tured tergum, &c. 



6. B. VESTITOR. — With prostrate hairs; basal joint of the 

 tergum bisinuate at tip. 



Inhabits Mexico. 



% Body with very numerous, minute, prostrate hairs ; head 

 blackish, with dilated dull fulvous orbits; before the antennae 



[Vol. L 



