I J5 Campbell, Dichofonious Key. 



Face disk deep chestnut, encircled with black. 



S. castanops (Chestnut-faced Owl). 



207. Total length more than 14.5 inches (female much larger than male) 208 

 Total length less than 14.5 inches (female much larger than male) 212 



208. Length 20 to 24 inches ; abdomen with cross markings . . . . 209 

 Length 18 inches and less ; abdomen with longitudinal markings 210 



209. General colour greyish ; two or three cross bars on each feather of 



breast. N. strenua (Powerful Owl). 



General colour dark brown ; breast feathers with numerous fine 



cross bars. N. humeralis (Rufous Owl). 



210. Length about 16 inches. . . . . . . . . • . 211 



Length less than 15 inches. N. peninsularis (Cape York Owl). 



211. Colour dark brown ; wing 12.5 inches. 



N. connivens (Winking-Owl), 

 Colour sandy brown ; wing 11. 5 inches. 



iV. occidcntalis (Western Winking-Owl.) 



212. LTnder surface deep rufous . . . . . . . . . . 213 



Under surface rufous, much marked with white . . . . . . 214 



213. Length 13.5 inches ; wing 8.6 inches or more. 



N. ocellata (Marbled Owl). 



Length about 12 inches ; wing 8.5 inches ; throat and breast very 



rufous. N. lurida (Lurid Owl). 



214. Back not spotted between shoulders ; wing to 10.3 inches. 



iV. hoohook (Boobook Owl). 

 Back spotted with white ; wing 9 inches. 



N. maculata (Spotted Owl). 



215. More than 20 inches long (female much larger than male) . . 216 

 Less than 20 inches long ; wing always less than 14 inches . . 226 



216. Length over 30 inches . . . . . . . . . . 217 



Length between 20 and 30 inches ; wing more than 14 inches . . 218 



217. General colour black or rufous. 



Uroactns aiidax (Wedge-tailed Eagle or Eaglehawk). 

 General colour grey and white (buff in youth). 



Haliastur leiicogaster (White-bellied Sea-Eagle). 



218. Head and breast black or white . . . . . . . . 219 



Head and breast rufous, streaked with brown or black . . . . 220 



219. Head and breast black ; wing 19 inches ; abdomen black and 



rufous. Gypoictinia melanosterna (Black-breasted Buzzard). 

 Head and breast white, mottled with brown ; wing 16 to 19 inches ; 

 abdomen pure white. 



Pandion leucocephalns (Osprey or Fish-Hawk). 



220. Tarsus 3.5 inches or over. Circus. Harriers. 221 

 Tarsus not more than 2.5 inches. . . . . . . . . 222 



221. Rump light colour ; breast with brown stripes. 



C. gouldi (Harrier or Swamp-Hawk). 

 No light rump ; breast rufous with white spots. 



C. assiniilis (Spotted Harrier). 



222. Under surface sandy or brownish (throat not lighter) . . . . 223 

 Under surface bright rufous, each feather with black centre, throat 



whitish ; wing 14 to 16 inches. 



Urospizias radiatiis (Red Goshawk). 



