Key to the Species. 
A. Larger; wing over 170 mm. .. 
B. Smaller ; wing under 120 mm. 
a. Head without elongated, hair-like feathers 
h. Head with elongated, hair-like feathers , . 
. . P. christiani, p. 267 
P. novce-hollandicB, p. 262 
. . P. poliocephalus, p. 265 
261 
