HYMENOPTERA. 399 



thorax anteriorly yellow ; the legs have a black pubescence, with 

 a few pale hairs at the base of the femora beneath ; wings fusco- 

 hyaline. Abdomen, the pubescence on the basal segment yellow, 

 on the three following segments it is fulvous, having a narrow 

 border of yellow, which divides it from the black pubescence 

 which clothes the apex. 



The colouring of the male and worker is the same, but less 

 bright, and the pubescence is longer in the male than in the 

 other sexes. 



Hab. North America ; Hudson's Bay ; Arctic America. 



53. BOMBUS VAGANS. B.M. 



Female. Length 7 lines. Black; the pubescence on the 

 head black, that on the thorax above pale bright yellow ; the 

 wings subhyaline, the apical margins have a fuscous cloud, the 

 pubescence on the legs black. Abdomen, the pubescence on the 

 two basal segments yellow, on the following it is black. 



Hab. North America. 



54. BOMBUS FRIGIDUS. B.M. 



Female. Length 7 lines. Black ; the pubescence of the 

 head black, mixed with a few pale hairs at the insertion of the 

 antennae; the vertex has also some pale yellow pubescence. 

 Thorax clothed with yellow pubescence, having a black band 

 between the wings, the latter fusco-hy aline ; the legs have a 

 black pubescence, the fringe on the posterior tibiae fulvous. 

 Abdomen, the two basal segments clothed with rich yellow pu- 

 bescence, the third with black, that on the apical segments 

 fulvous. 



Male. Resembling the female, but having the face clothed 

 with yellow pubescence. 



This species closely resembles the B. montanus of St. Fargeau. 

 of which it may be the arctic form. 



Hab. Arctic America ; Hudson's Bay. 



55. BOMBUS SONORUS. 



Bombus sonorus, Say, Bost. Journ. Nat. Hist. i. 413. 1. 

 Hab. Mexico. 



56. BOMBUS EPHIPPIATUS. 



Bombus ephippiatus, Say, Bost. Journ. Nat. Hist. i. 414. 2. 



Hab. Mexico. 



T 5 



