AVES FALCONID^. 603 



Circus pahistris, Less. Man. d'Orn. I. p. 105 (1828). 



Circus superciliostts, Less. Trait(i d'Orn. p. 87, pi. 3, fig. i (1831). 



Biiteo macropteriis, D'Orb. Voy. Amcr. Mcrid. p. 112 (1835). 



Harpyia macidosa, Swains. Classif. B. II. p. 208 (1837). 



Circus mcgaspilus, Gould, P. Z. S. 1837, p. 10 (Maldonado) ; Darw. Voy. 



Beagle, Birds, p. 29 (1841: La Plata, July); Pek. Reis. Novara, 



Vog. p. 14 (1865: Chili). 

 Spizacircus macropterus, Kaup, Mus. Senckenb. III. p. 258 (1845). 

 Circtis maculosus, Strickl. Orn. Syn. p. 155 (1855); Sharpe, Cat. B. Brit. 



Mus. I. p. 62 (1874); Gurncy, List Diurn. B. Prey, p. 20 (1884); 



Sharpe, Hand-list B. I. p. 245 (1899); Martens, Hamb. Magalh. 



Sammelr. p. 5 (1900: Punta Arenas); Albert, Contr. Estud. Avcs 



Chil. II. p. 507 (1901). 



General description. 



Size. — Adult male. 



Total length, about 21.00 inches. 



Wing, 17.00 inches. 



Culmcn, 1.40 inches. 



Tail, 9.9 inches. 



Tarsus, 3.2 inches. 



Qj/^r.— Adult. 



General color : Above, blackish, with a slaty blue shading ; below, white, 

 with some darker streaks and spots on the chest and flanks, as well as on 

 the axillaries. 



Head : Forehead and a connecting supraciliary stripe white, as is the 

 forepart of the cheeks ; crown and sides of the face black, with a bluish 

 gloss or shade ; the facial ruff the same shade, slightly spotted with pure 

 white. 



Neck : Above, like the head and back ; the throat and forcneck and 

 the chin white or whitish ; the ruff below plainly varied with white. 



Back: Mantle black and, like the crown, somewhat shaded with a blue 

 gloss ; lower back and rump uniform black ; upper tail-coverts white, often 

 showing traces of cinnamon or rufous cross-bars. 



Tail : Two central rcctrices ashy, crossed by five blackish bars and with 

 a broader subterminal band of like color tipped with dull whitish ; the rest 

 of the rectrices ashy on the outer and whitish on the inner webs and 



