AVES FALCONIDyE. 



665 



feathers of the breast are all decorated with tear-shaped median stripes of 

 deep black; the black-barred region of the lower parts is confluent across 

 the lower breast. 



Fig. 340. 



Falco fnsco-ccemlcscens. Adult male, P. U. O. C. 7946. Details of foot ; natural size. 



This bird taken in November had evidently bred and is in very worn 

 plumage. 



Immature birds of both sexes resemble the adults. (Male, P. U. O. C, 

 Rio Chico de Santa Cruz, Patagonia, i March, 1898, and female, P. U. O. C. 

 7901, Pacific Divide, Cordillera, Patagonia, 17 March, 1897). The white 

 regions about the head are creamy buff; the edging of the feathers of the 

 upper parts is tawny rufous, most conspicuous on the upper tail-coverts ; 

 the barring of the tail is obscured, particularly on the central rectrices. 

 Beneath, the pattern is similar to that of adults ; the chest and breast, how- 

 ever, differ much, being heavily marked with dark brown median stripes, 

 widening toward the extremity of the feathers ; the black sides do not meet 

 definitely on the breast and the feathers are not barred with white, as in 



