218 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



M. Underparts buflFy or buflFy white, spotted with dark brown 



or blackish B. swainsoni, juv., light i)hase (p. 297) 



hh. Underparts with no dark brown or black; the breast, at least, 

 rufescent. 

 i. Entire underparts nearly uniform dark rufous. 



B. swainsoni, ad., rufous phase (p. 296) 

 ii. The breast rufescent, throat white; abdomen buffy white, 

 unbarred or barred with rufous. 



B. swainsoni, ad. ? , light phase (p. 296) 

 ee. Size smaller, wing never over 325 mm. (usually under 300 mm.). 

 /. Middle toe without claw, longer than bare portion of tarsus in 

 front (Florida; Mexico, Central and South America). 

 g. Entire head and body vmiform dark brown or blackish. 



B. brachjairus, ad., dark phase (p. 352) 

 gg. Underparts whitish, plain or marked with brown. 



h. Underparts uniform wdiitish or buffy white, w'ith a chestnut 

 patch on either side of the breast. 



B. brachyurus, ad., light phase (p. 352) 

 hh. No chestnut patch on sides of breast; underparts whitish suf- 

 fused with tawny, sometimes streaked with brown, sometimes 



immaculate B. brachyurus, juv. (p. 354) 



ff. Middle toe without claw shorter than bare portion of tarsus in 

 front. 

 g. Abdomen and flanks m.ore or less barred with reddish brown. 

 h. Bars on abdomen sparse, narrow and poorly defined; size small; 

 wing, cf 227, ? 252 mm. (Antigua). 



E. platjTstenis insulicola, ad. (p. 319) 

 hh. Bars on abdomen abundant, wide, and well defined; size 

 larger; wing, cf over 250, 9 usually over 260 mm. 

 i. Dark marks on breast longitudinal streaks, not bars, the 

 brown streaks not or only slightly incised laterally by the 

 white margins of the feathers. 

 j. Size smaller; wing, cf 256 mm. or less, 9 266 mm. or less. 

 k. Crown fuscous, not fuscous-black or darker (Cuba). 



B. platypterus cubanensis, ad. (p. 317) 

 kk. Crown fuscous-black or darker. 



I. Uppcrparts generally fuscous-black (Lesser Antilles 



from Dominica to St. Lucia). 



B. platypterus rivierei, ad. (p. 322) 



II. LTpperparts generally blacker, deeper than fuscous- 



black (Puerto Rico). 



B. platypterus brunnescens, ad. (p. 318) 

 jj. Size larger; wing, cf over 256 mm., 9 over 266 mm. 

 (Canada to northern South America). 



B. platypterus platypterus, imm. (p. 308) 

 ii. Dark marks on breast so extensively incised laterally by 

 white as to produce the appearance of bars. 

 ;. Size smaller, wing, d' 245-255; 9 265-268 mm. 



k. General color slightly darker; the crown fuscous-black, 

 not fuscous; the breast markings tawny (Lesser An- 

 tilles from Dominica to St. Lucia). 



B. platypterus rivierei, ad. (p. 322) 



