FALCONID^ POLYBOROIDES 381 



a slight crest ; primaries, outer secondaries and primary coverts 

 black, the tips edged with white, and the inner primaries and 

 secondaries slaty at the base, inner secondaries slaty-grey, with 

 a round, subterminal spot of black ; lower back and upper tail- 

 coverts banded black and white ; tail-feathers black with a terminal 

 edging of white and broad bar of mottled black and white two- 

 thirds of the way down the feather; below, throat and chest like 

 the back ; abdomen, thighs, and under tail-coverts banded black 

 and white ; the band on the tail-feathers below is almost pure white. 

 Iris blackish-brown ; bill black, paler at the base ; cere, bare 

 skin round the eye and legs yellow ; claws black. 



FIG. 132. -Polyboroides tijpicus. x -fa. 



Length 25-5, in flesh 24-75; wing 18-0; tail 11-75; tarsus 3-30; 

 culmen 1-5. 



The female resembles the male but is larger ; length about 29-0 ; 

 wing 19-0; tail 13-0 ; tarsus 3-80 ; culmen 1-5. 



A young female is dark brown above with paler edges to the 

 feathers ; head crested, pale brown with bark brown centres to the 

 feathers, bare patch round the eye clothed with very short black 

 feathers ; the primaries are black, the tail very dark brown with 

 paler edging to the tip, but no trace of the cross band of the adult ; 

 below the neck and breast are dirty white with dark brown shaft 

 streaks to the feathers, the abdomen and thighs are pale brown with 

 faint traces of darker bands. 



A somewhat older bird resembles the adulfc except that the top 

 of the head is pale brown with dark brown centres to the feathers. 



