Key to the Subspecies. 
A. Fore-neck rufous-brown and white ; bare space round 
the eye yellow . . . . . . . . . . . . D.f. gouldi, p. 479. 
B. Fore-neck bluish-black and buffy-white ; bare space 
round the eye light brown . . . . . . ..D.f. olivei, p. 482. 
