238 KORTn AMERICA X BIRDS. 



extenilcd, and colors generally darker. Young : Tail hoarj' grayish, 

 growing gradually darker terminally, passing narrowly into dull whitish 

 or rusty at tip, and crossed bj" numerous narrow and verj' indistinct bars 

 of darker, these becoming gradually obsolete toward base of tail; gen- 

 eral color of plumage brownish black, the lower parts more or less varied 

 with whitish, buffy, or ochraceous. Boicmj young : Upper half of head 

 dark sooty brown, becoming nearlj- Mack around ej-cs; hind-neck, upper 

 back, and wings lighter sooty brown, fading gradually into dull brownish 

 buff on posterior upper parts and buffy whitish on lower parts. Male: 

 Wing 14.50-1G.75, tail 7.50-0.00, tarsus 3.30-3.G0, middle too 1.55-1.80. 

 Female: Wing 17.00-17.75. tail 8.25-10.30, culmcn .05-1.05, tarsus 3.30- 

 3.70, middle too l.lJO-l.SO. N'est on low trees or bushes (usuallj' a 

 yucca). Eiigs 2-4, 2.36 X 1 87, white, more or less blotched with reddish 

 brown. Hub. Whole of Jliddlc America, north to southern Texas. 

 341. B. albicaudatus sennetti Allen. Sennett's White tailed Hawk. 



Genus URUBITINGA Lksson. (Page 223, pi. LXX., fig. 2.) 

 Species. 

 Common Characters. — Adults, uniform plumbeous-black, tho upper tail-cov- 

 erts, baud across tip of tail, and other white bands on tail, pure white. Yottng : 

 Above varied with blackish brown and ochraceous, the former prevailing ; lower 

 parts ochraceous or pale buffj-, striped with dusky, the thighs barred with the 

 same; tail crossed l)y numerous narrow bands of blackish and light grayish, mixed 

 with white. 



a\ Tarsus 4.30 or more ; upper tail-coverts in adult plain white. 



6'. Tail, of adult, with only two to three white bands, tho broadest one more 

 than 2.50 (2.G0^.50) wide; thighs often without white bars, these when 

 present never (?) conspicuous; under wing-coverts destitute of white 

 marlcings, or else merely speckled with white; wing IG. 50-18. 00, tail 

 11.75-12.00, culmen 1.30, tar.sus 4.90-5.00. middle toe 1.90-2.10. Ifab. 

 Tropical America, north to Costa Rica (and Nicaragua?), south to Chili, 

 Paraguaj', and the Argentine Ropulilic. 



U. urubitinga (Gmel.). Brazilian Urubitinga.' 



i^ Tail, of adult, with three to four (usuallj- three) white bands, the broadest 

 one not more (usually much less) than 2.00 (1.20-2.00) wide; thighs 

 alwaj's marked (usually conspicuously barred) with while; under wing- 

 coverts always (?) barred or speckled with white; wing 15,15-10.50, tail 

 10.50-11.50, culmen 1.10-1.35, tarsus 4.30-4.85, middle toe 1.60-1.90. 

 Ilab. Guatemala and southern ilexico, north to Vera Cruz, Tchuante- 

 pec, and Mazatlan. U. ridgwayi Ourney. Mexican Urubitinga.' 



> Falco Kruhitimjn Gmel., S. N. i. 1788, 2fi5. Falcn somirus PiiAw, Gen. Zool. vii. 1809, 62. Vnibilwga 

 zcmira ScL., Trans. Zool. Soa. Lond. 1858, 262. 



' Vruhitimin zoiiitni $. ? RiDGW., Bull. V. ?. Gcol. A Gcog. Surv. Terr. ii. No. 2, 1S76, 1G9. Vriihitinga 



ridr/tcai/i GunxEV, List Diurn. B. Prey, 1S84, 77, IIS. 



