333 
Paraguay, Bolivia, and Southern Brazil . 
a. S ad. Luiconia, Ajo. April 29, 1909. 
Irides dark brown, orbits and cere pale lemon-coloured ; 
bill pale slate-coloured, dark at tip; legs and toes rich 
lemon-coloured, claws black. 
This specimen agrees with others in the British Museum, 
and tallies with the description given by Ridgway, having the 
tail tipped with rufous and the outer feathers unvariegated. 
In Miss Run^cles* collection there is a single male, also 
taken at Ajo, on the 15th of August, 1909, that agrees with 
the description by Ridgway of C. australis, having the tail 
tipped with white and the outer tail-feathers variegated. 
This little Kestrel is only a winter visitant to the Ajo 
district; but the dates of its arrival and departure I do not 
know, as very few are seen. I only noticed three or four 
throughout the winter of 1909. 
It is usually seen perched on the posts of the wire fencing 
or the tops of solitary trees, where it is, as a rule, easy of 
approach. 
187. Elanus leucurus. 
Elanus leucurus Sharpe, Cat. B. i. p. 339; Arg. Orn. ii. 
p. 71. 
a . S young. Los Ynglases, Ajo. Feb. 20, 1910. 
Quite a rare bird in the Ajo district, and I only observed 
two individuals during my visits. 
188. Rostrhamus sociabilis. 
Rostrhamus sociabilis Sharpe, Cat. B. i. p. 327 ; Arg. Orn. 
ii. p. 72. 
This Hawk is not represented in the collections made by 
me; but I have seen two young females and an adult male 
taken at Ajo, in the collection of Miss Runnacles. 
189. Milvago chimango. 
Ibycter chimango Sharpe, Cat. B. i. p. 41. 
Milvago chimango Arg. Orn. ii. p. 74. 
a . S • Los Ynglases, Ajo. Sept. 14, 1908. 
b. ? . „ „ Nov. 28, 1908. 
