FALCONID.E — THE HAWKS — ARCHIBUTEO. 



481 



the flanks and sidos having also some in-fgiilar liands of the same color. Nearly all the 

 feathers on the under parts with lines of dark brown on their shafts. Quills, with their 

 inner webs on the under surface, grayish or dark ashy, and near the shafts with a bronzed 

 olive lustre ; shafts white (on the under siu'face). Inferior coverts of the wing white, with 



B. oxypterus. 



sagittate spots of dark brown. Tiliial feathers yellowish-white, tinged with rufous, and 

 having irregular transverse bars of dark brown. 



Total length (sex unknown) about IG.OO ; wing, 13.50 ; tail, 7.00. 



Ilah. Fort Fillmore, New Mexico. 



A single specimen of this .species, considered by jMi'- Cassin to be diflerent 

 from all described North American raptores, was ol:)tained at Fort Fill- 

 more New Mexico. Rul.isequently Dr. Sclater, under the name of Butcofuli- 

 ^»ios».s, descrilied a bird of the same species from jMexico whicli was entirely 

 brownish-black, and wliicli j\[r. Cassin con.siders to be the adult. Additional 

 specimens and ol)Ser\'ation.s will be necessary before the cpiestion of rela- 

 tionship can be positively decided. (Baird.) 



Genus ARCHIBUTEO, Brehm. 



Archilnitf'O. Breiim, Isis, 1828, 1269. 



Gem. Char. Tarsi densely feathered to the toes, but more or less naked and scaly be- 

 hind. Wings long and wide ; toes short, claws moderate ; tail rather short and wide. 

 Form robust and heavy, generally larger th:in in Buteo. 

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