AVES FALCONID^. 66 1 



enough, not included in any notice of the avifauna of that region before 

 1888. The consternation caused among birds by its appearance is vastly 

 greater than that produced by any of the raptors I have mentioned ; and 

 it is unquestionably very much more destructive to birds, since it preys 

 exclusively on them, and, as a rule, merely picks the flesh from the head 

 and neck, and leaves the untouched body to its jackal, the carrion-hawk. 

 When the peregrine appears speeding through the air in a straight line at 

 a great height, the feathered world, as far as one is able to see, is thrown 

 into the greatest commotion, all birds, from the smallest up to species 

 large as duck, ibis and curlew, rushing about in the air as if distracted. 

 When the falcon has disappeared in the sky, and the wave of terror 

 attending its progress subsides behind it, the birds still continue wild and 

 excited for some time, showing how deeply they have been moved ; for, as 

 a rule, fear is exceedingly transitory in its effects on animals." 



Falco fusco-c^rulescens Vieillot. 



Alconcillo aplomado, Azara, Apunt. I. p. 175 (1802). 



Alconcillo obscuro azulejo, Azara, torn. cit. p. 179. 



Falco fitsco-ccErulescens, Vieill. N. Diet. d'Hist. Nat. XI. p. 90 (181 7; ex 

 Azara, p. 179); Fraser, P. Z. S. 1843, p. 109 (Chili); Sharpe, Cat. B. 

 Brit. Mus. I. p. 400 (1874: east Patagonia); Oust. Miss. Scient. Cap 

 Horn, Oiseaux, pp. 253, 324 (1891: Port Desire); Frenzel, J. f. O. 

 1 89 1, p. 114 (Cordoba); Lane, Ibis, 1897, P- ^80 (Vilugo); Sharpe, 

 Hand-list B. I. p. 275 (1899); Martens, Hamb. Magalh. Sammelr. p. 

 6 (1900; east and central Patagonia). 



Falco thoracicHS, Licht. Verz. Doubl. p. 62 (1823: ex Azara, p. 175). 



Falco femomlis, Temm. PI. Col. I. pis. 121, 343 (1823: ex Azara, p. 179); 

 Licht. Verz. Doubl. p. 61 (1823); D'Orb. Voy. Amer. Merid. p. 116 

 (1835); Darw. Voy. Beagle, Birds, p. 28 (1841 : Port Desire, Jan., 

 breeding); Burm. Reis. La Plata, II. p. 437 (186 1 : Pampas near Rio 

 Durato); Schl. Mus. Pays Bas, II. Falc. p. 20 (1862); Phil. & Landb. 

 Cat. Av. Chil. p. 4 (1868); Burm. An. Mus. Nac. Buenos Aires, III, 

 part X, p. 241 (1888: Patagonia), part XI, p. 316 (1890: Fortin 

 Villegas). 



Falco cyanescens, Vieill. Enc. Meth. Ill, p. 1234 (1823: ex Azara, p. 179). 



Hypotriorchis femoralis, Gray, Gen. B. I. p. 20 (1844); Hartl. Ind. Azara, 

 p. 3 (1847); id. Naum. 1853, p. 220; Pelz. Reis. Novara Vog. p. 8 



