^"ijs"'] Oberholser, Genera and Species of Cygnincc. o 



6.— Lores and bill black, with only a small spot of yellow 



(on the former) Olor coltmibianus. 



o'.— Lores and whole basal portion of bill yellow. 



c— Yellow of bill not extending to the nostrils ; wing 

 less than 555 mm. 

 d. — Smaller ; bill narrower (28-31 mm.) 



Olor bewicki bewicki. 

 i?'.— Larger ; bill wider (30.75-36 mm.) 



Olor bewicki minor. 



6^- -Yellow of bill extending bevond nostrils; wing 



more than 555 mm. . . " . . Olor cygnus. 



Clangocycnus,* sub-gen. nov. 

 Chars, sub-gen.— Dista.nce from the anterior angle of the eye to 

 the posterior border of nostril not much, yet usually a little, greater 

 than the distance from the latter to the tip of the bill ; bill longer 

 than head : tail commonly of 24 feathers ; bronchial dilatation very 

 large. 



Olor buccinator (Richardson). 



Cygnus buccinator, Richardson, in Swainson and Richardson's 

 Fauna Bor.-Amer., ii., 1831, p. 464. 



Cygnus passmori, Hincks, Journ. Linn. Soc. Lond., ZooL, viii., 

 1864, p. I (Toronto, Ontario, Canada). 



Chars, sp. — Lores and bill entirely black in adult ; entire plumage 

 white ; wing 535-700 mm. 



Type Locality. — Hudson Bay. 



Geographical Distribution —In summer from British Columbia, 

 Alberta, Assiniboia, Wyoming, the islands and western side of 

 Hudson Bay, formerly Indiana, Wisconsin, Iowa, Nebraska, 

 Montana, and Idaho, north to Franklin Bay, Mackenzie, and to 

 Alaska ; in migration south to Ontario, New York, Delaware, 

 Maryland, Ohio, Louisiana, Texas, Colorado, Arizona, and southern 

 Calif on da. 



This species differs from other members of the genus in several 

 minor structural characters of more or less importance, particularly 

 in the unusually large size of the bronchial dilatation, and possibly 

 deserves even generic separation. 



Sub-genus Olor (Wagler). 



Chars, sub-gen. — Distance from the anterior angle of the eye to 

 the posterior border of nostril miuch (about one-fifth) greater than the 

 distance from the latter to the tip of the bill ; bill not longer than 

 head ; tail usually of 20 feathers ; bronchial dilatation small or of 

 moderate size. 



Olor paloregonus (Cope). 



Cygnus paloregonus, Cope, Bull. U.S. GeoJ. and Geog. Surv. Terr., 



iv.. No. 2, 1878, p. 388. 



* KXayyi';, clangor ; KVKi'or, cygnus. 



