59 2 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



Circus histrionicus, Less. Voy. Coq. Zool. I. p. 616 (1826: Falkland 

 Islands); Vigors, Zool. Journ. III. p. 425, note (1827: Port Famine); 

 Hartl. Naum. 1853, p. 220 (Chili). 



Circus poliopterus, Cab. & Tschudi, Faun. Peruana, p. 113, pi. 3 (1845); 

 Schl. Mus. Pays. Bas. II. Circi, p. 6 (1862: La Plata); Pelz, Reis. 

 Novara, Vog. p. 13 (1865: Chili). 

 Spizacircus histrionicus, Kaup. Contr. Orn. 1850, p. 59. 

 Strigiceps histrionicus, Bp. Consp. Av. I. p. 35 (1850). 



GENERAL DESCRIPTION. 



Size. Adult male. P. U. O. C. 7904. Near Coy Inlet, Patagonia, 2 

 November, 1896. J. B. Hatcher. Or. No. 238. 



Total length, 19.00 inches. 



Wing, 12.90 inches. 



Culmen, to cere, 0.80; with cere, 1.25 inches. 



Tail, 8.60 inches. 



Tarsus, 2.75 inches. 



Adult female, P. U. O. C. 7905. Near Coy Inlet, Patagonia, 2 No- 

 vember, 1896. J. B. Hatcher. Or. No. 236. 



Total length, 21.80 inches. Wing, 14.60 inches. Tail, 9.75 inches. 



Blue phases of plumage. 



Color. Adult male cited. 



FIG. 296. 



Circus cinereus. Head of adult male. P. U. O. C. 7904. Natural size. 



General color above ashy blue, with white rump. Below, ashy blue on 

 throat and breast, the remainder of the under parts barred deep cinnamon 

 and white transversely ; the bars about equal in width and very regular in 

 disposal. 



