6 5 8 



PATAGONIAN EXPEDITIONS: ZOOLOGY. 



secondaries uniform with the color of the back ; seen from beneath, the 

 wing is pale whitish ash, definitely and regularly barred, except at the tips 

 of the quills, with ashy brown, vermiculated on the inner webs more or 

 less with the same shade. 



FIG. 336. 



Foot of Falco cassini ; adult female, P. U. O. C. 7902. From in front; natural size. 



Lower parts : Chin and throat immaculate white ; upper breast immac- 

 ulate white, save for the very narrow black shaft lines of some of the 

 feathers and in some individuals a shading of cream-color on fawn ; the 

 rest of the under surface white or creamy white, with a decided shading of 

 faint grey, each feather crossed with three or more narrow black bars, some- 

 times showing a tendency to arrow-shaped marks, this particularly in the 

 mid-breast and on the flanks and feathered parts of the legs ; the region 

 about the vent is almost immaculate and the under tail-coverts, the 

 axillaries and the under wing-coverts are barred like the rest of the lower 

 surface. 



