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. —Polijboroides tijijicus. x f^. 



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

 culmen 15. 



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. 



x\ somewhat older bird resembles the adult except that the top 

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



