BUTEO. 237 



usually distinctly barred or transversely spotted with white. 

 Young : Lower parts usually with whitish predominating, and 

 basal half of outer webs of quills extensively ochraceous, buffy, 

 or whitish. Male : Length 17.50-19.50, wing 11.25-13.50, tail 

 8.00-9.70, culmen .75-.90, tarsus 2.70-3.25, middle toe 1.30-1.50. 

 Female: Length 19.00-22.00, wing 13.35-14.25, tail 9.00-10.00, 

 culmen .80-.90, tarsus 3.10-3.20, middle toe 1.35-1.50. Eggs 

 2.13 X 1-69. Hab, Eastern North America, north to Nova 

 Scotia and Canada, west to edge of Great Plains. 



339. B. lineatus (&MEL.). Red-shouldered Hawk. 

 d 2 . Adult : Eufous or rusty of anterior lower parts (chest and breast) 

 usually (always ?) unbroken. Young : Lower parts with deep 

 brownish or dusky prevailing; buffy or ochraceous spots on 

 outer webs of quills much reduced in extent. Male: "Wing 

 12.00-12.50, tail 8.00-9.00, culmen .78, tarsus 2.90, middle toe 

 1.40-1.52. Female: Wing 13.00, tail 9.50, culmen .90, tarsus 

 3.00-3.12, middle toe 1.50. Eggs 2.19 X 1.71. Hab. Pacific 

 coast of United States (and south into Mexico ?). 



339&. B. lineatus elegans (CASS.). Red-breasted Hawk. 

 c 2 . Adult with head and neck grayish, with little if any rufous tinge. 



Adult: Head and neck brownish gray, the feathers with dusky 

 shaft-streaks ; those of occiput white, with dusky tips ; back and 

 scapulars dull ash-gray, the feathers with large terminal or sub- 

 terminal spots of dusky (occupying most of exposed portion of 

 each feather) ; lower parts (including breast) barred with white 

 and pale ochrey rufous. Young : Similar to corresponding stage 

 of B. lineatus, but smaller and darker in color. Wing 10.90-12.75, 

 tail 7.70-8.50, culmen .80-.90, tarsus 2.90-3.20, middle toe 1.25-1.45. 



Hab. Florida 339a. B. lineatus alleni EIDGW. 



Florida Red-shouldered Hawk, 



a 2 . Tail less than half as long as wing; tarsus about half as long as tail ; primaries 

 exceeding secondaries by nearly the length of the tail. (Subgenus Tachy- 

 triorchis KAUP. 1 ) 



Only three outer quills with inner webs distinctly emarginated. Adult 

 male : Above (except rump) plain bluish gray (varying to slaty or even 

 dusky), the anterior lesser wing-coverts rufous, the longer scapulars 

 much tinged with the same ; tail white, crossed near end by a broad 

 band of black, anterior to which are numerous narrow bars or lines of 

 slate-gray or plumbeous, or dusky ; rump and lower parts pure white, 

 the throat sometimes dusky or grayish ; flanks, rump, and under wing- 

 coverts usually faintly barred with ashy, dusky, or rufous. Adult female : 

 Similar to adult male, but rufous patch on lesser wing-coverts more 



1 TachytriorcMs KATTP, Class. S'aug. u. Vbg. 1844, 123. Type, Falco pterocles TEMM., = / T . albicaudatua 

 VIEILL. 



