BIRDS OF NOETH AND MIDDLE AMERICA. 



387 



fianks broadljr streaked with .same. II. BvfDioi ]}Jimi<i': Above nearly- 

 uniform chestnut or chestnut-rufous, the upper rump, sides of neck, 

 and supra-auricular region slightly intermixed with olive or olive- 

 grayish; under parts as in the grayish phase, but the chestnut-rufous 

 spots larger, more confluent.^ 



Touvg. — Essentially like adults, but colors duller and markings less 

 sharplj' defined. 



Adult w^/Z^\— Length (skins). 150.88-172.72 (lfi4:.8.5); wing, 8fi.36- 

 91.69 (89.15); tail, 67.06-73.91 (70.36); exposed culmen, 10. 67-1 li. 95 

 (12.45); depth of bill at base, 9.14-10.41 (9.91); tarsus, 24.13-25.40 

 (24.89); middle toe, 16.00-17.53 (16.76).-' 



Adult female.— Length, (skins). 156.97-170.18 (161.80); wing, 83.82- 

 87.88 (85.85); tail, 66.S0-73.15 (69.34); exposed culmen. 10.67-12.19 

 (11.68); depth of bill at base, 9.14-10.16(9.40); tarsus, 23.11-25.40 

 (24.89); middle toe, 15.49-17.53 (16.26).' 



Northern North America; .breeding from Nova Scotia, Magdalen 

 Islands, Anticosti Island, Newfoundland, northern Maine, Province of 

 Quebec, etc. , northward and northwestward to valley of Lower Ander- 

 son River, Kowak River, and Bering seacoast of Alaska (north of 

 the Alaska peninsula) ; south in winter to northern Florida and west- 

 ward to middle Texas (San Antonio, Navarro County, Kendall County, 

 etc.), and eastern base of Rocky Mountains; occasional on southern 

 coast of Alaska during migration (Portage Bay, February). 



^ These two plumages represent the extremes, as shown in only a small percentage 

 of specimens, a large majority being variously intermediate, most of them about 

 half way between. The extreme rufous phase seems to be represented only in the 

 Atlantic coast district, and is altogether wanting in Alaska and other northwestern 

 portions of the continent, where only birds representing the gray extreme occur. 

 Many specimens from the Atlantic coast are practically indistinguishable from the 

 Alaskan specimens, however, and I am therefore unable to satisfactorily distinguish 

 two geographic forma. 



^ Ten specimens. 



' Seven specimens. 



Alaskan specimens average larger than eastern examples, except as to the feet; 

 and, in view of the fact that apparently the grayest examples only occur there, it 

 may eventually become necessary to separate them. At present, however, the num- 

 ber of specimens available for comparison, especially of summer birds, is much too 

 small to warrant such procedure. Average measurements of Alaskan and Atlantic 

 coast specimens are as follows; 



