302 AMERICAN HYMENOPTERA. 



by the different coloration of the third and fourth dorsal 

 segments of its abdomen and by its more strongly punctate 

 clypeus. 



Specimens of this species are rather somber in appearance 

 and without sharp contrasts in the coloration of their pile. 

 A considerable portion of the yellow pile of most specimens 

 has a strong tendency to be pale and lustreless. The ferru- 

 ginous-yellow pile on the apical dorsal abdominal segments 

 varies greatly in shade, being sometimes whitish and some- 

 times strongly ferruginous. 



Bombiis (Bonibus) arcticus Kirby. 

 II Apisalpina O. Fabricius, Fauna Gronland, 1780, p. 199 (Non Linn6). 

 ? * Bombus hyperboreus Schonherr, Svensk. Vet.-Akad. Handl., XXX, 

 1899, p. 57, 9 , T. 3, F. 2. 

 " arcticus W. Kirby, Anim. Parry's First Voy., 1821, Ap- 

 pend., p. 216, 9 cf . 

 ? " hyperboreus Dahlbom, Bombi Scandin., 1832, p. 42, n. 



19. 

 " arcticjisQ-urXXs,, Desc. Insects CI. Ross' Second Voy., 1834, 



App., p. 64, n. 8, 9 cf. 

 Erichson, Arch. f. Naturg., II, P. 1, 1836, p. 288, 

 n. 10, 9 cJ'. 

 ? " hyperboreus Zetterstedt, Insect. Lappon., I, 1838, p. 475, 



n. 11, 9. 

 ? " " Nylander,Notis. Saellsk. Faun, and Fl. Fenn. 



Forh., I, 1848 (Adnot.), p. 230, n. 8. 

 " groenlandicus (Westermann) Smith, Catal. Hymen. Brit. 



Mus., II, 1854, p. 393, n. 23, 9 . 

 " hyperboreus Schiodte, Etzel's Gronland, p. 611. 



" arcticus Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 95, 



n. 13, 9 c?. 

 " groenlandicus Cresson, Proc, Ent. Soc. Phila., II, 1863, p. 



97, n. 16, 9 . 

 " hyperboreus Q,r^%^Q)U,VTOC. Ent. Soc. Phila., II, 1863, p. 



108. 

 ? " " Thomson, Opusc. Entom., P. 2, 1870, p. 256, 



n. 14, 9 c?. 

 ?* " " Thomson, Hymen. Scandin., II, 1872, p. 34, 



n. 12, 9 S cT. 

 " arcticus Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 



230 (Catal.), 

 " groenlandicus Cresson, Trans. Amer. Ent. Soc, VII, 

 1879, p. 230 (Catal.). 



