ORNITHOLOGICAL CLUB. 37 



tions of the lower surface immaculate. Axillars immaculate pure white ; 

 lining of the wing pale cream-color, with longitudinal tear-shaped mark- 

 ings or streaks of rusty brown ; under primary coverts with a large patch 

 of grayish-brown, formed by the terminal half or more of each feather be- 

 ing of this color ; inner webs of the primaries immaculate white anterior 

 to their emargination. Wing, 15.70 ; tail, 9.00. 



This specimen presents a very close general resemblance to 

 lighter colored examples of the young of B. borealis, the only obvi- 

 ous difference being the cluster of spots on the jugulum (which in 

 borealis is plain white), the obsolete character of the bars on the 

 tail, and the more slender tarsi. 



Dark Phase (No. 9,689, Europe). — Prevailing color clove-brown, or 

 sooty grayish-brown, this entirely unbroken on the upper surface, but be- 

 neath slightly variegated with very narrow whitish streaks on the cheeks 

 and throat, irregular bars and spots of the same on the abdomen ; tibial 

 feathers with rusty tips ; crissum grayish-white with brownish spots and 

 bars ; white of under surface of primaries broken by a confused sprinkling 

 or mottling of grayish ; lining of the wing sooty-brown, irregularly spotted 

 with buff and rufous. Tail grayish-brown, considerably lighter than the 

 wings, narrowly tipped with dirty whitish, and crossed by narrow bands of 

 darker brown, the last of which is much the widest (about 1.00 in breadth), 

 the others decreasing in distinctness toward the base. Darker bars on the 

 remiges almost entirely obliterated. Wing, 16.40 ; tail, 9.00. 



This example is almost identical in coloration with the dark 

 phase of Buteo swainsoni* the only obvious difference being the 

 white bars and spots on the abdomen. 



Young Male. 

 Light Phase, Albinescent ? (No. 56,104, Germany). — Prevailing color 

 pure white ; head, neck, and lower parts immaculate, except a few narrow 

 streaks on the forehead and below the auriculars, a few scattered streaks 

 on the side of the breast, and a slight spotting on the sides ; occiput and 

 nape more distinctly streaked. Lesser wing-coverts almost immaculate 

 pure white, and middle coverts so broadly bordered with white that this 

 color prevails ; greater coverts tipped with white. Back dark brown, 

 the feathers narrowly bordared with white ; scapulars with broader 

 white margins. Entire rump and upper tail-coverts immaculate creamy 

 white. Remiges and rectrices as usual, but the middle pair of the latter 

 with their inner webs buffy white, with broken bars and spots of grayish- 

 brown. Wing, 15.50 ; tail, 9.75. 



* See Pr. Ac. Nat. Sci. Philad., March 30, 1875, p. 115. 



