6O2 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



it. When it appears unexpectedly, sweeping over a hedge or grove with 

 a rapid flight, it is sometimes mistaken for a more dangerous species ; 

 there is then a little flutter of alarm, some birds springing into the air, 

 but in two or three seconds of time they discover their mistake, and settle 

 down quietly again, taking no further notice of the despised carrion- 

 eater. On the other hand, I have frequently mistaken a harrier (Circus 

 cinereus, in the brown state of plumage) for a chimango, and have only 

 discovered my mistake by seeing the commotion among the small birds. 

 The harrier I have mentioned, also the C. macroptems, feed partly on 

 small birds, which they flush from the ground and strike down with their 

 claws. When the harrier appears moving along with a loitering flight 

 near the surface, it is everywhere attended by a little whirlwind of alarm, 

 small birds screaming or chirping excitedly and diving into the grass or 

 bushes ; but the alarm does not spread far, and subsides as soon as the 

 hawk has passed on its way. Buzzards (Buteo and Urubitinga] are much 

 more feared, and create a more widespread alarm, and they are certainly 

 more destructive to birds than harriers." 



CIRCUS BUFFONI (Gmel.). 



Falco buffoni, Gmelin. Syst. Nat. i. p. 277, 1788 (Cayenne). 



Alilargo, Azara, Apunt. I. p. 136 (1802). 



Gavilan de estero chorreado, Azara, t. c. p. 74. 



Aquila maculosa, Vieill. Ois. 1'Amer. sept. pi. 3 bis. (1807). 



Circus macropterus, Vieill. N. Diet. d'Hist. Nat. IV. p. 458 (1816: ex 



Azara, p. 136); Hartl. Ind. Azara, p. 3 (1847); Schl. Mus. Pays 



Bas, II. Circi, p. 8 (1862: Patagonia); Scl. & Salv. Ibis, 1868, p. 



183 (Sandy Point); iid. P. Z. S. 1868, p. 143 (Conchitas) ; Phil. & 



Sandb. Cat Av. Chil. p. 6 (1868) ; Cunningh. Nat. Hist. Str. Magell. 



pp. 53, 214 (1871) ; Scl. & Salv. Nomencl. Av. Neotr. p. 1 18 (1873) ; 



Doering, Expl. al Rio Negro, Zool. p. 50 (1882: Rio Colorado); 



Gurney, List Diurn. B. Prey, p. 20 (1884); Aplin, 1894, Ibis, 1894, 



p. 194 (Uruguay). 

 Circus albicollis, Vieill. N. Diet. d'Hist. Nat. IV. p. 456 (1816 : ex Azara, 



p. 74): Hartl. Ind. Azara, p. i (1847). 

 Circus leucophrys, Vieill. t. c. p. 454. 

 Morphnus maculosus, Cuv. Regn. Anim. I. p. 319 (1817). 

 Falco palustris, Temm. PI. Col. I. p. 22 (1824). 



