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252 



Say^s Descriptions of 



and 



thorax polished : wings purplish-fuliginous^ with three or 

 four ohsolete, small, white spots ; cellules regular : ter- 

 gum with numerous longitudinal, elevated lines on each 

 segment ; first segment with the lines transverse and in- 

 terrupted by a large, elevated oval lobe on the disk, 

 which has a longitudinal line and irregular rugae; the 

 lateral edge elevated ; 2d and 3d segments with an ob- 

 lique indented line af base each side : oviduct two thirds 

 the length of the abdomen, black, clothed with short 

 hairs : feet piceoys-black. 



Length $ three tenths of an inch. 



The remarkable appearance of the tergum readily dis- 

 tinguishes this species from popuJator^ Nob. which it re- 

 sembles. It has a general resemblance to B. initiator^ 

 Fabr. 



3. B< hehetor. Black; head, thoracic Imes, tibice 

 base of the abdomen honey-yellow. 



Inhabits Indiana. 



Body black, polished : head pale honey-yellow ; an- 

 tennae, region of the stemraata, of the antennse and spot 

 on the hypostoma, black : mandibles robust, black at tip : 

 thorax with two obsolete, piceous, oblique lines confluent 

 at the middle and terminating in a spot each side of the 

 scutel : wings dusky, nervures black ; stigma rather 

 large ; nervure from the stigma, oblique to the 2d cubital : 

 abdomen depressed, oblong-ovate : coxa, knees and base 

 of the tibiae, yellowish-white : oviduct shorter than the 

 abdomen. 



^ Abdomen whitish at base. 



Length nearly one tenth of an inch. 



The antennae of the male are 22 -jointed and those of 

 the female are short, more robust, fourteen-jolnted. The 

 short, thoracic piceous lines have sometimes a cmciform 

 appearance by being continued around the scutel. 



