398 Mr. H. DurnforcVs Notes on the 



edges and bases of feathers lightest ; back dark rufous brown 

 and black ; primaries have black tips, edged with white ; 

 secondaries and tertials marbled with dusky white and black; 

 tail black, marbled with grey; chest and stomach rufous, 

 streaked with black; thighs rufous and black; iris light 

 orange ; legs pale primrose-yellow. 



Hypotriorchis femoralis, 



Resident, but most numerous in the winter. We saw it 

 but rarely during our journey. A nest found on the 3rd of 

 November was placed on the top of a thick thorn-bush, and 

 formed of twigs and sticks, lined with grass. It contained 

 three eggs, in colour rich yellowish red, thickly speckled all 

 over with dark rufous spots. This is the swiftest Hawk 

 in Patagonia. 



*TlNNUNCULUS SPARVERIUS. 



Resident, and frequently observed throughout our journey. 



*P0LYB0RUS THARUS. 



Resident and abundant everywhere. The plumage of this 

 species varies exceedingly. I have seen some nearly as light 

 as cream-colour, and from that to the ordinary brown. This 

 variation, however, as far as I am aware, does not occur in 

 Buenos Ayresf. 



^MlLVAGO CHIMANGO. 



Resident and abundant everywhere. 



■^Sarcorhamphus gryphus. 



Commonly observed throughout our journey wherever the 

 rocks were high and steep. Several pairs were nesting on 

 the 16th November on the ledges of some rocks in the valley 

 of the Sengel ; but I was unable to get at the nests. 



■^Phalacrocorax brasilianus. 



Resident. Common on the Sengel and Sengelen. Every 



t [This remark of Mr. Durnford's throws much light on the question 

 as to the specific validity of the curious specimens of Polyborus from Pata- 

 gonia now living in the Zoological Gardens, of which figures were given 

 in the 'Proceedings' for 1876, pi, xxv. — Edp.] 



