Order LARIFORMES 
No. 151. 
Family LARIDJE. 
BRUCHIGAVIA NOV^-HOLLANDIiE LONGIROSTRIS. 
WESTERN SILVER GULL. 
Bruchigavia LONGIROSTRIS Masters, Proc. Linn. Soc. N.S.W., Vol. II., p. 113, 1877 ; 
King George’s Sound, West Australia. 
BrucJiigavia longirostris Masters, Proc. Linn. Soc. N.S.W., Vol. II., p. 113, 1877. 
Larus (Xema) longirostris Ramsay, ih., p. 201, 1877 ; id., Tab. List Austr. Birds, p. 22, 
1888. 
Larus novm-hollandim MilKgan, Emu, Vol. II., p. 76, 1902 ; Carter, ih., Vol. III., p. 208, 
1904 ; Lawson, ih., Vol. IV., p. 132, 1905 ; Whitlock, ih., Vol. VIII., p. 194, 1909 ; 
Crossman, ih., Vol. IX., p. 148, 1910 ; Ogilvie-Grant, Ibis 1910, p. 184. 
Larus novce-hollandice longirostris Mathews, Nov. Zool., Vol. XVIII., p. 211, 1912. 
Distribution. South-west AustraHa ; North-west Austraha. 
Adult. Differs from L. n. novce-hollandice in its dark red longer bill and longer legs. The 
mirrors on the first and second primaries are smaller, and there is rarely any 
mirror on the third ; in senile specimens a small white spot is sometimes present ; 
wing 300 mm., culmen 39, tarsus 55. 
Immature in fully adult 'plumage. Fully described by Masters, whose account I 
reproduce {post). 
Immature in post-nesthng plumage have small mirrors on the first and second 
primaries. 
Nestling, Nest, and Eggs. Appear to be undescribed. 
Breeding-season. October (Milligan) ; April (Carter). 
Mr. Milligan* says : “ In the ledges of rock at the base of the Pandion’s 
nest at Gape Mentelle these birds were nesting. Some of the nesting-places 
contained fully feathered young, other young in a less advanced stage, and 
others again eggs. This was the first week of October.” 
Mr. Tom Carter sends me the following note : “A common species all along 
the coast of West Australia, but I noticed that they were not seen at Point 
Cloates from January to April every year, doubtless having gone to the 
south coasts to breed there, as I never saw them breeding in the North-west, 
but in April, 1911, I was presented with seven fresh eggs by Mr. A. F. H. 
Muir, who resides on his station at Lake Muir, in the South West. They were 
* Emu, Vol. II., p. 76, 1902. 
468 
