370 BULLETIN 50, UNITED STATES NATIONAL MUSUEM. 



AdMlt female. — Length (skin), 264;. wing, 134; tail, 132; exposed 

 culmen, 20; tarsus, 34.5; middle toe, 17." 



Alaska, except treeless coast district north of Alaska peninsula and 

 coast forest from Cook Inlet east and southward. 



Perisoreus canadensis (not Corvus canadensis Linnaeus) Dall and Bannister, Trans. 

 Chicago Ac. Sci., i, 1869, 286 (St. Michael, Port Yukon, etc., Alaska).— 

 FiNSCH, Abh. Nat. Forh. Brem., iii, 1872, 40 (Kenai Peninsula, Alaska). — 

 CouES, Check List, 1873, no. 239, part.— Adams, Ibis, 1878, 426 (30 miles n. 

 of St. Michael). 



l^Perisoreas] canadensis Coues, Key N. Am. Birds, 1872, 166, part. 



Perisoreus canadensis var. obscurus, part, Ridgway, Bull. Essex Inst., v, Nov., 

 1873, 194, part (Alaska) ; v, Dec, 1873, 199, part (Alaska).— Baibd, Bkewbe, 

 and EiDGWAY, Hist. N. Am. Birds, ii, 1874, 302, part (specimens from Alaska). 



Perisoreu^ canadensis fumifrons Eidgway, Proc. U. S. Nat. Mus., iii. Mar. 27, 



1880, 5 (St. Michael, Alaska; coll. U. S. Nat. Mus.) ; Norn. N. Am. Birds, 



1881, no. 2976. — BEicHENOwand Schalow, Journ. fiirOrn., 1884, 401 (reprint 

 of orig. descr. ). — Coues, Check List, 2d ed., 1882, no. 360. — Nelson, Cruise 

 "Corwin," 1881 (1883), 73 (Alaska Peninsula to Kotzebue Sound); Nat. 

 Hist. Coll. Alaska, 1887, 164, pi. 11 (lower Yukon; "Kadiak and Sitkan 

 districts"). — McLenegan, Cruise "Corwin," 1884, 117 (Kowak R., n. w. 

 Alaska). — American Ornithologists' Union, Check List, 1886, no. 4845. — 

 Turner, Contr. Nat. Hist. Alaska, 1886, 167 (St. Michael; Yukon R.).— 

 TowNSEND, Cruise "Corwin," 1885 (1887), 92 (Kowak R.); Auk, iv, 1887, 

 12 (do.).— Bendire, Life Hist. N. Am. Birds, 1895, 390.— Osgood, N. Am. 

 Fauna, no. 21, 1901, 77 (Hope City and Tyonek, Cook Inlet).— Howe, 

 Osprey, new ser., i, 1902, 105, part (crit. ). 



Plerisoreusi canadensis fumifrons Ridgway, Man. N. Am. Birds, 1887, 360. 

 P[^erisoretis'] c[anadensis'] fumifrons Coues, Key N. Am. Birds, 2d ed., 1884, 425. 



PERISOREUS CANADENSIS CAPITALIS Baird. 

 WHITE-HEADED JAT, 



Similar to P. c. canadensis, but larger and lighter colored; whole 

 head white, except immediately round aijd behind eyes, which, together 

 with the hindneck, are slate-grayish (in more northern specimens inclin- 

 ing to blackish slate) ; gray of upper and under parts paler. Young 

 paler than that of P. c. canadensis or P. c. fumifrons, with pileum 

 much paler gray or grayish white, the feathers of under parts more 

 or less tipped with white or pale grayish. 



Adult OT,aZe.— Length (skins), 263-287.5 (273.5); wing, 146.5-157.5 

 (153.5); tail, 139-151.5 (146.5); exposed cuhnen, 20.5-22.5 (21.5); 

 depth of bill at base, 10.5-11.5 (11); tarsus, 34.5-38 (36); middle toe, 

 18-21 (19.5).* 



Adult female. — Length (skins), 264-283 (270); wing, 143.5-151 

 (148.5); tail, 140-149 (143.5); exposed culmen, 19.6-21.5 (21); depth 

 of bill at base, 9.5-10.5 (10); tarsus, 32-35.5 (34.5); middle toe, 17-19.5 

 (18)." 



Higher coniferous forests of the Rocky Mountain district, from 



a One specimen. 6 Ten specimens. c Seven specimens. 



