368 AMERICAN HYMENOPTERA. 



Boiiibus (Boiiibus) flavifrons Cress. 

 ? Bombus praticola W. Kirby, Faun. Bor.-Amer., IV, 1837, p. 274, 

 n. 381, 9 . 

 flavifrons Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 105, 



n. 35, 9 S c?. 

 praticola Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 106, 



n. 36, 9. 

 flavifro7is Cresson, Proc. Davenp. Acad. Nat. Sci., I, 1876, 



p. 210 — also Putnam, on p. 195. 

 praticola Bethune (Reprint, W. Kirby's Faun. Bor.-Amer.), 



Can. Ent., X, 1878, p. 118. 

 flavifrons Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 

 231. (Catal.). 

 Bowles, Rep't Ent. Soc. Ont., 1880, p. 33. 

 Cresson, Syn. Hym. No. Amer., 1887, p. 307. 

 praticola Provancher, Addit. Faun. Canada. Hymen., 1888, 



p. 341, n. 10, ^ (not the S ). 

 flavifrons Ant. Handlirsch, Ann. naturh. Hofmus. Wien., 

 Ill, 1888, p. 231 (pars.). 

 " Ant. Handlirsch, Ann. naturh. Hofmus. Wien., 



VI, 1891, p. 453 (pars.). 

 flavifrons Dalla Torre, Cat. Hym., X, 1896, p. 520 (pars.). 

 praticolus Dalla Torre, Cat. Hym., X, 1896, p. 541. 

 flavifrons Titus, Can. Ent., XXXIV, 1902, pp. 39 and 43, 



9 8 cf. 



alaskensis Ashmead, Proc. Wash. Acad. Sci., IV, 1902, p. 128. 



dimidiatus Ashmead, Proc. Wash. Acad. Sci., IV, 1902, p. 



129 (not Harris, Catal. Insects Mass., 1835, p. 70). 



flavifrons var. veganus Cockerell, Amer. Nat., XXXVII, 



1903, p. 891. 

 alaskensis Ashmead, Hym. of Alaska, 1904, p. 134. 

 dimidiatus A&\iT!iea.di, Hym. of Alaska, 1904, p. 135. 

 praticola H. Friese, Ann. du Mus. Zool. de I'Acad. Imp. 



des Sci. de St. Petersb., 1904, Tome IX, no. 4 . 

 flavifrons Cockerell, Trans. Amer. Ent. Soc, XXXII, Nov., 

 1906, p. 312. 

 Cockerell, Univ. Color. Studies, IV, 1907, p. 257. 

 praticolus Fletcher and Gibson, Can. Ent. Rec (Ann. Rep't 

 Ent. Soc. Ont.), 1908, p. Ill (pars.). 

 " flavifrons-dimidiatus Cockerell, Can. Ent., XLII, 1910, p. 25. 



Types. — At least a part of Cresson's type specimens are in 

 the collection of the American Entomological Society. Ash- 

 mead's type specimens of alaskensis and dimidiatus are in the 

 collection of the United States National Museum. I have 

 carefully examined and compared these specimens. 



