704 BOSTON JOURNAL 



3. B. GIBBOSUS. — Black ; nasus gibbous ; terminal joints of 

 the antennas short. 



Inhabits Indiana. 



9 Body somewhat polished, black ; nasus with a prominent 

 gibbosity ; antenna3 with the joints of the terminal third not 

 longer than broad : wings slightly fuliginous : stigma robust ; 

 the abbreviated ncrvure at base stigma very robust and very 

 near to the costal nervure : tergum, second segment at base with 

 two large foveolae; oviduct as long as the abdomen and thorax to 

 gether ; [251] feet, terminal half of the thighs and basal portion 

 of the tibiae dull honey -yellow. 



Length hardly over one-tenth of an inch. 



The smallest species I have met with. 



BEACON Jurine, Latr. 



t Separating nervure between the radial and cubital cellule arcuated ; 

 second cubital cellule not very much elongated. 



1. B. PECTiNATOii. — Black; abdomen yellowish ; wings black- 

 ish; cellules regular. 



Inhabits United States. 



Head rather large and robust, concave behind at the neck ; 

 rostrum not prominent; thorax with the dorsal sutures dilated 

 and containing very obvious transverse lines ; the transverse su- 

 ture at base of the scutel with five elevated lines ; wings dark 

 violaceous ; second cubital cellule shorter and smaller than the 

 first, quadrangular; nervure forming the radial cellule rectili- 

 near ; oviduct exserted, black. 



Length 9 to tip of wings nearly two fifths of an inch. 



I am not certain whereabout this insect was captured, but I 

 think I obtained it in the N. W. Territory when engaged on the 

 northern expedition with Major Long. 



It resembles the popiilator, but the rectilinear form of the 

 nervure of the radial cellule places it nearer ruga tor nob., and 

 initiator F.; from the former it is distinguished by the more sim- 

 ple surface of the tergum, and from the latter by the much shorter 

 second cubital cellule. 



2. B. RUGATOR. — Sanguineous; head, wings and feet blackish; 



tergum wrinkled. 



Inhabits Indiana. 



[Vol. I. 



