ORDER PICI. 189 
GENUS XENOPICUS Bairp. 
Xenopicus Batrp, Rep. Expl. & Surv. R. R. Pac., IX, 1858, 83. Type, 
by monotypy, Leuconerpes albolarvatus Cassin. 
Xenopicus albolarvatus (CAssIN). White-headed Woodpecker. [399.] 
Leuconerpes albolarvatus Cassin, Proc. Acad. Nat. Sci. Phila., V, 1850, 
106. (Oregon Cafion, near Georgetown, 12 miles from Sutter’s Mill, 
California.) 
Rance.— Transition Zone in mountains from southern British 
Columbia to southern California, east to eastern Oregon, western 
Idaho, and western Nevada. 
GENUS PICOIDES Lac&prpDeE. 
Picoides Lackprpr, Tableaux Ois., 1799, 7. Type, by subs. desig., Picus 
tridactylus LINNaUS (Gray, 1840). 
Picoides arcticus (SwaINson). Arctic Three-toed Woodpecker. [400.] 
Picus (Apternus) arcticus Swainson, Fauna Bor.-Am., II, 1831 (1832), 
313. (Near sources of Athabaska River, Lat. 53° N., eastern declivity 
of Rocky Mountains.) 
RancGe.— Canadian Zone of northern North America from southern 
Alaska, central Yukon, southern Mackenzie, central Keewatin, and 
southern Ungava south to the Sierra Nevada of California and moun- 
tains of Nevada, Idaho, Wyoming, South Dakota (Black Hills), Minne- 
sota, Michigan, northern New York, Vermont, New Hampshire, and 
Maine; casual in winter to Nebraska, Illinois, Ohio, Massachusetts, 
and Connecticut. 
Picoides americanus BrEHM. 
RancGe.— Northern North America, south in Rocky Mountains to 
New Mexico and Arizona. 
a. Picoides americanus americanus BreuM. Three-toed Woodpecker. 
[401.] 
Picoides americanus BreHM, Handbuch Végel Deutschl., 1831, 195. 
(‘‘ Amerika.’’) 
