66o PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Neck : Nape, hind neck and sides like the crown, the nape tinged with 

 chestnut and the feathers all margined to a greater or less degree with the 

 same shade ; throat and chin deep creamy buff. 



Back : Like the crown and neck in general color throughout, the feathers 

 all margined with rufous, or chestnut, except on the rump and upper tail- 

 coverts, where they are tipped definitely with buff. 



Tail blackish, with a strong brown undertone ; each rectrix is crossed 

 with four or more indistinct grey bars, which shade into rufous on the 

 inner webs ; all the tail feathers tipped with deep creamy buff. 



Wings : The upper wing-coverts like the interscapular region in color 

 and margins ; the quills, except the inner secondaries, blackish-brown, the 

 inner webs notched or half barred with rufous ; the inner secondaries like 

 the back and tipped with buff. 



Lower parts : Chin and throat as described, deep creamy buff, which 

 changes on the breast to deep reddish brown, stronger on the breast 

 and sides, paler on the abdomen and under tail-coverts ; all the feathers 

 medianally streaked with a long blackish spot, which becomes more 

 prominent and arrow-shaped on the feathers of the flanks ; the lower sur- 

 face presents a streaked, not a barred appearance ; the under wing-coverts 

 and axillaries deep rufous, barred or mottled with blackish. 



Bill : Dull greenish yellow, shading into bluish green at the tip ; the 

 cere dull greenish yellow. 



Feet : Yellow ; the claws brown. 



Iris : Dark hazel-brown. 



Geographical Range. — Chili, southern Patagonia and adjacent regions. 

 The lands about the Straits of Magellan. Common in the province of La 

 Plata, Argentina (W. H. Hudson). 



Cassin's Peregrine was secured by Mr. Hatcher on the two occasions 

 above cited and seems to be a fairly common bird throughout the Straits. 

 It is the most destructive bird-hawk of the country it inhabits, feeding on 

 ducks, herons and small species like doves and tinnamou. It breeds on 

 the faces of cliffs in inaccessible places, its eyrie being used for many 

 seasons, if not continuously, for it is rarely disturbed. There are no sets 

 of eggs in the collection of the British Museum, but these are doubtless 

 very like those of the other large peregrines. 



Hudson, in his Naturalist in La Plata (pp. 95-96), says: "The wide- 

 ranging peregrine falcon is a common species in La Plata, although, oddly 



