You7!ff. Differs from the adult in being duller in colour, and much browner on the head and wings, with 

 narrow ashy-whitish edges to the inner secondaries; supraloral white streak more distinct; 

 throat tinged with sandy butf; fore neck and chest mottled with brown bases, and the centre of 

 the chest with a distinct brown streak caused by the brown inner webs of the feathers ; gape 

 yellow. 



Hab. Chili and Bolivia, Patagonia. 



This species lias much of the appearance of the Common Martin of Europe (Chelidon 

 urbicu), and Mr. Gould aptly remarked, in 1841 : — " Were it not for the bare legs of this 

 little Martin, I should have some difficulty in discriminating between it and the one so 

 well known as a summer visitor in our island." The structural characters of the 

 species prove, however, that it is a member of the genus Tachycineta, which is strictly 

 an American form. 



Mr. Darwin met with this Swallow in Southern Patagonia, at Port Pamine, in 

 February, and found it breeding in holes in a cliff of earth. Dr. Cunningham procured 

 specimens at Sandy Point in January, and in the same month and at the same place 

 the naturalists on board the ' Challenger' likewise met with it. 



This species probably winters in Chili ; for Mr. Darwin found it near Valparaiso 

 from August to September, and Capt. Markham at Coquimbo in November. Mr. E. C. 

 Heed has sent several specimens from the province of Colchagua. A Bolivian specimen, 

 procured by Mr. Bridges, and preserved in the Sclater collection, marks the highest 

 northern range of this species, so far as is known at present. 



We are not aware that any notes on the habits have yet been recorded. 



Our descriptions are from specimens in the British Museum, and the figure has 

 been taken from a bird in the Salvin-Godman collection. 



