Order PR0CELLARIIF0RME8 Family DIOMEDEIDM. 
No. 118. 
THALASSOGERON CHRYSOSTOMA CULMINATUS. 
AUSTRALIAN FLAT-BILLED MOLLYMAWK. 
(Plate 97.)* 
Diomedea cuLMmATA Gould, Proc. Zool. Soc. (Lond.) 1843, p. 107; Bass Strait. 
Diomedea culminata Gould, Proc. Zool. Soc. (Lond.) 1843, p. 107 ; id., Birds Austr., 
Vol. VII., pi. 41, 1848 ; id., Handb. Birds Austr., Vol. II., p. 436, 1865 ; Ramsay, 
Proc. Linn. Soc. N.S.W., Vol. II., p. 202, 1877 ; id.. Tab. List Austr. Birds, 
p. 23, 1888 ; Buller, Suppl. Birds New Zeal., Vol. I., p. 154, 1905. 
Thalassiarche culminata Forbes, Rep. Voy. “ Challenger,” Zool., Vol. IV., p. 13, 1882. 
Thalassogeron culminatus Baird, Brewer, and Ridgway, Water-Birds North Amer., Vol. II., 
p. 358, 1884 ; Salvin, Cat. Birds Brit. Mus., Vol. XXV., p. 451, 1896 (pars) ; North, 
Birds County Cumber., p. 115, 1898 ; Hall, Key Birds Austr., p. 96, 1899 ; Campbell, 
Nests and Eggs Austr. Birds, p. 934, 1901 ; Hall, Key Birds Austr., p. 96, 1906 ; 
Mathews, Handl. Birds Austral., p. 19, 1908 ; Godman, Monogr. Petrels, p. 354, 1910 ; 
Littler, Handb. Birds Tasm., p. 188, 1910. 
Diomedea cJirysostoma Mathews, Nov. Zool., Vol. XVII., p. 497, 1910 
Distribution. Australian seas 
Adult male. Head, hind-neck and mantle grey with white base to the feathers, becoming 
dark brown or black on the middle of the back, scapulars and wing-coverts ; lesser, 
median, and greater wing-coverts dark brown, with whitish bases hke the bastard- 
wing, primary-coverts and quills, the latter with white shafts and pale brown 
inner webs ; secondaries dark brown with white on the basal portion ; olecranal 
feathers dark brown with pale inner webs which become white at the base ; rump 
and upper tail-coverts pure white ; tail dark hoary-grey with white shafts ; 
feathers above and in front of the eye black ; sides of face, throat, and fore-neck 
white, more or less washed with grey ; remainder of the under surface white ; 
axillaries pale grey with whitish tips ; feathers round the margin of the up(^er-wing 
blackish ; bill black, the culmen yeUow, divided from the tip, which is horn-colour, 
by a black patch, base and lower edges of mandible yellow ; feet and legs grey, 
webs fleshy -pink. Total length 910 mm. ; culmen 111, wing 518, tail 213, tarsus 86. 
Adult female. Similar to the adult male. 
Nest, Egg, and Breeding -season. Unknown. 
* The Plate is lettered Diomedea cJirysostoma. 
VOL. n. 
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