708 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



stripes; the nuchal collar with practically no buffy or ochraceous tinge; 

 the white bars on the inner webs of the remiges broader, wider than 

 the dark interspaces, usually reaching entirely across the webs, and 

 the outer webs with pale spots in corresponding positions; rectrices 

 paler than their upper coverts, light gull gray becoming whitish on the 

 inner webs of all but the median pair; the subterminal broad black 

 band is narrower (15-25 mm.) and anterior to this are five narrower 

 (5-10 mm.) bands of the same; frontal line and supcrciliaries whiter, 

 less washed with pinldsh buff; cheeks and auriculars whiter, the 

 dark shaft stripes very much finer; chin and upper throat immaculate 

 or almost immaculate; the streaks on the breast, abdomen, sides, and 

 flanks drab to hair brown with narrow fine blackish shaft lines; thighs 

 not washed with ochraceous buff; entire underparts only slightly 

 tinged with pale buff. 



Adult female. — Similar to the adult male, but with a fulvous or 

 sandy wash on the upperparts; rectrices hair brown where there is 

 black in the male; pale spots on remiges slightly suffused with pale 

 tawny buff; chin, upper throat, thighs, lower abdomen, and under 

 tail coverts practically immaculate, at most only a few fine, faint 

 shaft lines on the thighs and under tail coverts. 



Juvenal male. — Generally similar to the adult female, but with none 

 of the grayish tone above, top of head Saccardo's umber with black 

 shaft stripes; upper surface of wings and body hair brown, the feathers 

 narrowly edged with pale ochraceous or rusty hair brown; the tail as 

 in adult female, but the dark bars darker, fuscous to chaetura drab. 



Juvenal female. — Like the juvenal male, but the dark bars of the 

 tail paler, hair brown, darkening to fuscous only in the broad sub- 

 terminal band; crown and occiput slightly paler, buckthorn brown. 



Natal down. — As in nominate form. 



Adult male.—Wmg 195-203 (197.7); tail 117-132 (124); culmen 

 from cere 12-13.5 (12.5); tarsus 35.5-40 (37.4); middle toe without 

 claw 29-34 (30.9 mm.).^ 



Adult female.— Wmg 210-228 (220.2); tail 126-149 (137.4); culmen 

 from cere 13.5-15 (14.1); tarsus 38-42 (41.1); middle toe without claw 

 33-37 (35.4 mm.).«* 



Range. — Breeds in the Great Plains region of northern Alberta 

 (Calgary, Lac la Nonne, Kcd Deer River, Castor, Edmonton, Sullivan 

 Lake); central Saskatchewan (Cypress Hill, Grand Rapids, Fort 

 Pelley, Carleton House); southern Manitoba (Oak Lake); Montana 



«^ 12 specimens from Alberta, Saskatchewan, Wyoming, North Dakota, Colo- 

 rado, and Oklahoma. 



f' 9^ 10 specimens from Alberta, Saskatchewan, Montana, Colorado, and Sonora, 

 Mexico. 



