230 NORTH AMERICAN BIRDS. 



e 1 . Middle toe decidedly longer than bare portion of tarsus in 

 front ; length of cere on top less than depth of bill at an- 

 terior edge of cere. 



/ l . Outer webs of quills (in adult) plain hoary grayish, paler, 

 or more ashy, at tips ; naked portion of tarsus, in front, 

 2.00. 



Adult : Head, neck, and lower parts white, the first 

 streaked with dusky, these streaks more crowded 

 across cheeks, where forming a rather distinct 

 " mustache" ; throat very narrowly streaked, the 

 sides, flanks, and lower part of belly (sparsely), 

 more broadly streaked with dusky, and sides of 

 breast with broader, somewhat wedge-shaped, 

 markings of the same ; thighs tinged with buffy 

 or ochraceous ; under wing-coverts white, with a 

 large dusky patch covering anterior portion of 

 lesser covert region ; upper parts in general dark 

 slaty brownish, tinged here and there ashy and 

 somewhat broken by irregular admixture of 

 whitish, especially on scapulars and larger wing- 

 coverts ; rump blackish ; upper tail-coverts white, 

 tinged with rufous, and crossed by irregular, 

 distant bars of dusky; tail mostly light rufous, 

 but this much broken by irregular longitudinal 

 washes and " daubs" of ashy, and darker longitu- 

 dinal mottlings or interrupted streaks, on both 

 webs ; crossed near end by an irregular but dis- 

 tinct band of blackish, the tip white, and the basal 

 portion whitish ; length about 21.50, wing 15.75, 

 tail 9.10, culmen 1.05, tarsus 3.25, middle toe 1.70. 

 Hob. California (Santa Clara) ; only one example 

 known. . B. cooperi CASS. Cooper's Henhawk. 

 /*. Outer webs of quills grayish brown, marked with quad- 

 rate dusky spots, producing bands; bare portion of 

 tarsus in front less than 2.00. 



g 1 . Middle toe usually more than 1.60 (minimum 1.50, 

 maximum 1.95) ; tail of adult usually with much 

 of rufous, with or without darker bands ; young 

 with tail grayish brown, crossed by nine or ten 

 distinct narrow bands of dusky. 

 h l . Head and neck uniform dark sooty brown or 

 blackish, or else streaked with white (very 

 rarely, if ever, streaked with buffy or ochra- 

 ceous). Adult: Tail confusedly or irregu- 

 larly mottled with grayish, rusty, white, and 



