AVES FALCONID^. 



639 



Head: Each feather with a black shaft making a hair-line. Clear, cold 

 slate above ; the forehead, lores and cheeks white, the cheeks streaked 

 with slaty. 



Neck : Above clear slaty, the feathers with the shafts black as on the 

 crown, making a hair-stripe ; chin and throat pure white. 



Fig. 324. 



Fig. 325. 



Buteo crytlironotus. Detail of foot from in 

 front. P. U. O. C. 8307. Natural size. 



Butco crytlironotus. Detail of foot from 

 side. P. U. O. C. 8307. Natural size. 



Back: Interscapular region and lower back clear slate, the feathers with 

 black hair-line shafts ; rump shading into white, with slate bars to each 



