600 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



POLYBORUS CHERIWAY AUDUBONH Cassin 



Audubon's Caracara 



Adult (sexes alike). — Forehead, crown, occiput, nape, scapulars, 

 upper wing coverts, secondaries, and inner primaries, lower back, 

 rump, abdomen (except posteriomedian portion), sides, flanks, and 

 thighs very dark fuscous, darkest on the top of the head; interscapu- 

 lars cartridge buff to pale buffy white, usually whiter toward the tip, 

 crossed by broad transverse spots (often actually bars) of deep fus- 



FiGURE 44. — PolyboTus cherituay. 



cous-black, the pale interspaces narrow, and the tips whitish, the 

 adjacent feathers of the upper back so extensively dark fuscous-black 

 as to be merely crossed by five or more very narrow whitish bars; 

 outermost five or six primaries basally whitish to just beyond the 



