238 PROCEEDINGS OF THE ACADEMY OF 



DESCRIPTION OF A NEW VARIETY OF. BTJTEO. 

 BY BERNARD A. IIOOPES. 



BuTEO BOREALis, Variety icriderii. PI. 5. 



Male. Bill strong, wide at the base, much curved, blue, darker 

 towards the tip, edges of the upper mandible lobed. Cere blue and 

 large. Nostrils large and roundish. Entire head and nape pure 

 "white, with the exception of a few feathers on each side of the 

 forehead at the base of the upper mandible, which are tipped with 

 dark-brown. Lores white, covered with bristl}' hairs, a faint super- 

 ciliar}' line of an ochreous tint extends beyond the ej'es. 



Cheeks white, with several lines of feathers, uarrowh' tipped 

 with dark-brown, extending down the sides of the neck and a 

 short distance under the wings. Back brown, largel}^ spotted with 

 white, which is the prevailing color of the base of the feathers, 

 some of them are edged with yellowish-brown ; many of the 

 feathers on the upper part of the back are arrow-shaped, or 

 pointed, faintly edged with white. 



Wings long and wide, of the prevailing color of the back, with 

 lighter tints on the shoulders ; the white of the under side of the 

 wings extending over the edges. 



Primaries dark, first quill shortest, third, fourth, and fifth nearly 

 of a size (fourth rather the longest), of an ash}^ tint on the outer 

 edges, the inner quills white, transversely barred with l)rown. 

 Secondaries darker, similarlj- marked. Hump the same color as 

 the back, feathers edged with rufous and white. Upper tail-coverts 

 white. 



Tail white, with an ochreous tint, darker towards the ends of 

 the two middle feathers, banded with eleven irregular transverse 

 bars of brown, the feathers rounded, or slightly i^ointed and 

 tipped with white. 



Throat, breast, and entire under parts pure white, inside of 

 wings the same, first five quills edged with bluish-ash, inner webs 

 largel}- white and strongly sinuated. A few sagittate spots of 

 brown appear on the flanks and abdomen ; tibial feathers long, 

 having a very faint yellowish tinge. Under tail-coverts white, 

 almost imperceptibly barred with faint lines, inside of tail-feathers 

 white, the bars on the outside faintly showing through. Tarsus 



