94 PROCEEDINGS OF THE ACADEMY OF 



crossed by more than eleven narrow and very indistinct bands of 

 dusky ; inner webs reddish-white. Prevailing color above brownish- 

 black, with a purplish cast ; head, neck, and lower parts ochraceous- 

 white. Dorsal region and wing-coverts much variegated longi- 

 tudinally with deep ochraceous; head and neck streaked with 

 black ; lower parts spotted with dark purplish-brown ; tibiae with 

 sparse, longitudinally-sagittate, markings of the same. Tail- 

 coverts (upper and lower) very distinctly barred transversely. 



2. Buteo (Craxirex) poliosomus. 



Falco polyosoma, Quoy. & Gahn. Voy. Uran. Ois. 1824, 92, pi. 14. Astur 

 polyosoma, Cuv. Reg. An. I. 1829, 332. Buteo poliosomit, Less. 

 TraitS, 1831, 82. Btrickl. Orn. Syn. I. 1855, 219. Scl. P. Z. S. 1860, 

 384. Abbott, Ibis. 1861, 151. Scl. & Salv. Norn. Neotrop. 1873, 119. 

 Buteo poliosoma, Sharpe, Cat. Ace. B. M. 1874, 171. ? Buteo cen- 

 tralis, Gould, P. Z. S. 1837, 10. Darwin, Zool. Beag. pi. 3, 27. 

 Gray, Gen. (sub. borealis) sp. 6. Bonap. Consp. 19. Strickl. Orn. 

 Syn. I. 31. Cass. Expl. Exp. Orn. 1858, 94, pi. 3, fig. 2 ( o jus. ?) 

 Buteo varius, Gould, P. Z. S. 1837, 10 Darw., Zool. Beag. 1841, 26. 

 Cass. Expl. Exp. Orn. 1858, 92, pi. 3, f. 1 ($ jus.). Peale, Expl. 

 Exp. Orn. 61. ?Scl. P. Z. S. 1860, 384. 



Habitat. Chili, Patagonia, Tierra del Fuego, and Falkland 

 Islands. 



Description. Adult. " Bluish slate-color above and below, a 

 little clearer about the head and throat ; lores whitish ; upper and 

 under tail-coverts white, with slaty-gray cross bars and mottlings 

 of the same color ; tail white crossed with about nine narrow 

 bands of slaty-gray, and a very broad subterminal band of slaty- 

 black ; primaries black, externally shaded with silvery-gray, the 

 secondaries entirely slaty-gray like the back, tipped with white ; 

 primaries white at base of inner web, with remains of dusky slate- 

 colored bars. Total length 22 inches; culmen, 1.4; wing, 15.25 ; 

 tail, 8.5; tarsus, 3.4." (Sharpe, 1. c.) 



"Female (? in changing plumage) : All over blackish slate-color, 

 excepting the hinder neck, the entire mantle and upper scapulars, 

 the centre of the breast, extending on to the chest and centre of 

 the abdomen, all these rufous portions of the body more or less 

 obscured with slate-color ; quills black, silvery-gray near the base, 

 barred with black; inner face of quills ashy-white, with a few 

 dusky crossbars ; lower back, rump, and upper tail-coverts ashy, 

 the former slightly washed with rufous ; tail ashy-white, with 

 about nine narrow bars and a broad subterminal band of slate- 



