230 NOliTU AMERICAN LIRDS. 



d}. Middle toe decidedly longer than bare portion of tarsus in front; 



length of cere on top less than depth of bill at anterior edge 



of cere. 



e'. Outer webs of quills (in adult) plain hoar^- grayish, paler, 



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



than 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 " mus- 

 tache" ; throat very narrowly streaked, the sides, 

 flanks, and lower part of bell}' (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 irregu- 

 lar longitudinal washes and "daubs" of ashj-, and 

 darker longitudinal mottlings or interrupted streaks, 

 on both webs ; crossed near end by an irregular but 

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

 portion whitish ; length about 21.50, wing 15.75, tail 

 9.10, culraen 1.05, tarsus 3.25, middle toe 1.70. Iltib. 

 California (Santa Clara) ; onh' one exam]ile known. 



— . B. cooperi Cass. Cooper's Henhawk. 

 e'. Outer webs of quills grayi>h brown, marked with quadrate 

 dusky spots, producing bands ; bare portion of tarsus in 

 front less than 2.00. 

 /'. Middle toe usually more than l.GO (minimum 1.50, maxi- 

 mum 1.95); tail of adult usually with much of rufous, 

 with or without darker bands; young with tail grayi.sh 

 brown, crossed by nine or ten distinct narrow bands 

 of dusky. 

 g^. Ilead and neck uniform dark sooty brown or blackish, 

 or else streaked with white (vciy rarely, if ever, 

 streaked with buffj' or ochraceous). Adult: Tail 

 confusedly or irregularly mottled with grayish, 

 rusty, white, and duskj-, either color predominating 

 (oxcei)t the last) according to the individual. 



