12 
19a. Necrosyrtes monachus pileatus (Burch.), S. Africa, 
Trav., ii., p. 195 (1824). [Hopetown dist.. N.E. & 
Cape Province. | E. Airica: 
Hooded Vulture. 
Larger ; length 26in. ; wing 480-510 mm. ; 
with shorter and stouter bill. 
Fam. IV. AQUILIDZ. 
Crown of head always clothed with feathers, its sides either feathered 
or bare; outer toe not reversible. Female usually larger than 
male. 
Sub-Fam. I. POLY BORINZ. 
Toes connected near base by interdigital mem- 
brane ; sides of face mostly bare. 
Gen. XIV. POLYBORUS Vieill. (1816). 
Type “ Caracara ” Buff [= P. plancus]. 
Nostrils oval. Size large (22-26 in.). 
+*20. Polyborus plancus (Mill.) Var. Subj. Nat. S. America, 
Hist., Pl. 17 (1778). [Tierra del Fuego.] Patagonia to 
Common Caracara. 20° S. lat. on 
W. & Amazon 
Wing 2 405; tail 240 mm.; above and on E. side. 
below blackish brown with narrow whitish 
bars; crown and belly uniform; tail 
whitish with dusky crosslines and a terminal 
blackish band; face and throat white. 
$21. Polyborus cheriway cheriway (Jacq.), Beitr., S. United States 
p. 17, tab. 4 (1784). [Venezuela.] Central and 
Audubon’s Caracara. Northern 
S. America. 
