HENRY J. FRANKLIN. 447 



This species is very closely allied to B. rufocinctus Cress., 

 and it is possible that extensive collecting will show that it 

 should be considered either a subspecies or a color variant 

 of that species, 



I take pleasure in naming this species for Mr. Samuel 

 Henshaw, Curator of the Museum of Comparative Zoology, 

 who loaned me one of the specimens. 



Genus PSITHYKUS Lepeletier. 

 Apis (ex parte) Fabricius, Ent. Syst., II, 1793, p. 317, and other old 



authors. 

 Apis * * e, 2, Kirby, Monog. Ap. Angl., I, 1802, p. 209. 

 Bombus (ex parte) Fabricius, Syst. Piez., 1804, p. 342, and other old 



authors. 

 Bremus (ex parte) Panzer, Faun. Insect. German., VIII, 1805. 

 Uneigentliche Hummeln Illiger, Magaz. fiir Insektenk., V, 1806, p. 



173. 

 Bremus (ex parte) Jurine, Nouv. Meth. Class. Hymen., 1807, p. 257. 

 Bombus, Divisio secunda, Dahlb. Bomb. Scand., 1832, p. 30. 

 Psithyrus Lepeletier, Ann. Soc. Ent. France, I, 1832, p. 372. 

 Apathus Newman, Ent. Magaz., II, 1834, p. 404, nota. 

 Psithyrus Lepeletier, Hist. Nat. Insect, I, 1836, pp. 33 and 458. 



Westwood, Int. Mod. Class. Insect., II, 1840, p. 280. 



Lepeletier, Hist. Nat. Insect., II, 1841, p. 424. 

 Apathus Smith, Cat. Bees of Great Britain, 1855, p. 234. 

 Bombus (ex parte) Greene, Ann. Lye. Nat. Hist. N. Y., VII, 1860, p. 



169. 

 Apathus Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 110. 

 Packard, Proc. Essex Instit., IV, 1864, p. 118. 

 Thomson, Opusc. Ent., I, 1869, pp. 7 and 12. 

 Psithyrus Schmiedeknecht, Apidae Europaeae, I, 1882-84, pp. 385 to 



391. 

 Apathus Provancher, Faun. Ent. Can., II, 1883, pp. 728 and 736. 

 Psithyrus Dalla Torre, Cat. Hym., X, 1896, p. 565. 



Sharp, Insects, II, 1899, p. 59. 



Ashmead, Trans. Amer. Ent. Soc, XXVI, 1899, p. 58. 



Robertson, Trans. Amer. Ent. Soc, XXIX, 1903, p. 176. 



Schmiedeknecht, Hym. Mitteleurop., 1907, p. 24. 



Type of genus. — Psithyrus rupestris (F.), the first species 

 placed under the genus by Lepeletier. 



Common names. — The bees of this genus are, in common 

 with those of Bombus, popularly known as "Humble-bees " 



TRANS. AM. ENT. SOC, XXXVIII. 



