398 
Mr. H. Durnford^s Notes on the 
edges and bases of feathers lightest; back dark rufons 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. 
E/Osident, 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. 
— *Tinnunculus sparverius. 
Resident, and frequently observed throughout our journey. 
*PoLYBORUS 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 Ayres f. 
*Milvago 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. 
-f- *Phalacrocorax brasilianus. 
Resident. Common on the Sengel and Sengelen. Every 
t [This remark of ^Ir. Durnford’s throws much light on the question 
as to the specific validity of the curious specimens of Polyhorus from Pata¬ 
gonia now living in the Zoological Gardens, of which figures were given 
in the ^Proceedings’ for 1876, pi. xxv. —Edd.] 
