Order FALC0NIF0RME8 
No. 310. 
Family FALGONID^. 
FALCO HYPOLEUCUS. 
GREY FALCON. 
(Plate 253.) 
Falco hypoleucos Gould, Proc. Zool. Soc. (Loud.) 1840, p. 162, 1841 ; West Australia. 
Falco hypolemus Gould, Proc. Zool. Soc. (Loud.) 1840, p. 162, 1841 ; id., Birds Austr., 
Vol. I., pi. 7, 1848 ; Sturt, Exped. Centr. Austr., Vol. II., App., p. 13, 1849 (Central) ; 
Gould, Handb. Birds Austr., Vol. I., p. 24, 1865 ; Sharpe, Cat. Birds Brit. Mus., 
VoL I., p. 394, 1874 ; id., Proc. Zool. Soc. (Bond.) 1875, p. 339 (Q.) ; Kamsay, 
ih., p. 579 (Q.) ; id.. Cat. Austr. Accip., p. 49, 1876 ; id., Proc. Linn. Soc. N.S.W., 
Vol. II., p. 177, 1878 ; id.. Tab. List Austr. Birds, p. 1, 1888 ; North, Austr. Mus. 
Cat., no. 12, p. 17, 1890 ; Cox and Hamilton, Proc. Linn. Soc. N.S.W., Ser. II., 
Vol. IV., p. 398, 1890 (N.S.W.) ; North, Austr. Mus. Cat., no. 4, p. 53, 1898 ; Hall, 
Key Birds Austr., p. 3, 1899 ; Campbell, Nests and Eggs Austr. Birds, Vol. I., p. 33, 
1901 ; Berney, Emu, Vol. V., p. 18, 1905 (Q.) ; Mathews, Handl. Birds Austr., p. 42, 
1908 ; Whitlock, Emu, Vol. VIII., p. 178, 1909 (W.A.) ; Mathews, ih., Vol. IX., 
p. 56, 1909 (N.W.A.) ; id., Nov. Zool., Vol. XVIII., p. 252, 1912 ; North, Austr. 
Mus. Spec. Cat., no. 1, Vol. III., p. 265, 1912 ; Mathews, List Birds Austr., p. Ill, 
1913 ; Witmer Stone, Austral Av. Rec., Vol. I., p. 146, 1913. 
Hierofalco hypoleucus Bonaparte, Rev. Mag. Zool., 1854, p. 535. 
Oennaia hypoleuca Gurney, Ibis 1882, p. 450. 
Falco hypolemus ashleyi Mathews, Austral Av. Rec., Vol. II., p. 73, 1913; South AustraHa. 
Distribution. Australia : not Tasmania. 
Adult female. Head, back and wing-coverts bluish-grey, lighter on the rump: all the 
feathers have black shaft-streaks ; under-surface light grey with black shaft-streaks ; 
under wing-coverts white with black shafts ; tail grey crossed with about twelve 
dark bars, which become Hghter towards the base, upper tail-coverts showing Ught- 
coloured bars ; primary-coverts blackish, the inner webs marbled ; primaries blackish, 
the inner webs notched with black and marbled. Soft parts as in the figured 
specimen. Total length 395 mm. ; cuhnen 16, wing 298, tail 135, tarsus 45. 
Collected in South Australia. The sexes are alike, the female being sfightly the larger. 
Immature male. General colour pale slate-grey with dark shaft-lines and whitish margins 
to the feathers of the back, wings and tips of tail-feathers ; bastard-wing, 
primary-coverts and primary-quills darker and inclining to blackish with whitish 
tooth -like marks on the inner webs of the latter ; some of the tail-feathers have 
indications of pale bars on the inner webs ; the feathers on the hind-neck are white 
234 
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