OF NATURAL HISTORY. 



705 



Rostrum distinct : head piceous; antennae black; [252] tho- 

 rax polished ; wings purplish-fuliginous, with three or four ob- 

 solete, small, white spots; cellules regular; tergum with numer- 

 ous longitudinal, elevated lines on each segment; first segment 

 with the lines transverse and interrupted by a large, elevated 

 oval lobe on the disk, which has a longitudinal line and irregu- 

 lar Yugse ; the lateral edge elevated ; second and third segments 

 with an oblique indented line at base each side ; oviduct two- 

 thirds the length of the abdomen, black, clothed with short hairs • 

 feet piceous-black. 



Length 9 three-tenths of an inch. 



The remarkable appearance of the tergum readily distinguishs 

 this species from populator nob., which it resembles. It has 

 a general resemblance to B. initiator Fabr. 



3. B. HEBETOR. — Black'; head, thoracic lines, tibiae and base 

 of the abdomen honey-yellow. 



Inhabits Indiana. 



Body black, polished ; head pale honey-yellow; antennae, re- 

 gion of the stemmata, of the antennae 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 

 second cubital ; abdomen depressed, oblong-ovate ; coxae, 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 twenty-two-jointed and those, of 

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

 thoracic piceous lines have sometimes a cruciform appearance by 

 being continued around the scutel. [253] 



4. B. DORSATOR. — Yellowish, antennae, three thoracic lines 

 J and tip of the tergum, black. 



Inhabits Indiana. 



Body yellowish, somewhat fulvous, a little polished : antennae 

 short, rather robust, black ; area of the stemmata blackish : tho- 

 1835.] 45 



