Order PR0CELLARIIF0BME8 
No. 119. 
Family DIOMEDEIDM. 
THALASSOGERON CHLORORHYNCHOS BASSI. 
EAST AUSTKALIAN YELLOW-NOSED MOLLYMAWK. 
(Plate 98.)* 
Diomedea BASSI Mathews, Nov. ZooL, Vol. XVIII., p. 206, 1912 ; East Australia. 
Diomedea cMororhynchos Gould, Birds Austr., Vol. VII., pi. 42, 1844 ; id., Handb. Birds 
Austr., Vol. II., p. 437, 1865. 
Diomedea chlororhyncha Buller, Birds New Zeal., p. 294, 1873 ; Ramsay, Proc, Linn. Soc. 
N.S.W., Vol. II., p. 202, 1877 ; id., Tab. List. Austr. Birds, p. 23, 1888 ; Buller, 
Birds New Zeal., 2nd ed., Vol. II., p. 202, 1888 ; id., Suppl. Birds New Zeal., 
Vol. I., p. 154, 1905. 
Thalassogeron chlororhynchus Salvin, Cat. Birds Brit. Mus., Vol. XXV., p. 451, 1896 (pars) ; 
North, Birds County Cumber., p. 116, 1898 ; Hall, Key Birds Austr., p. 96, 1899 ; 
Campbell, Nests and Eggs Austr. Birds, p. 935, 1901 ; Hall, Key Birds Austr., 
p. 96, 1906 ; Mathews, Handl. Birds Austral., p. 19, 1908 ; Godman, Monogr. Petrels, 
p. 357, 1910 ; Littler, Hand. Birds Tasm., p. 189, 1910. 
Distribution. East Austrahan seas. 
Adult male. Back, scapulars and wings slaty-brown, tail-feathers hoary-grey, lesser, 
median, and greater wing-coverts dark brown with white bases, Kke the bastard- wing 
and primary-coverts ; primary-quills black on the outer webs, hoary-grey on the 
inner ones, with white shafts at the basal portion ; secondaries dark brown, white 
on the inner webs ; some of the feathers of the olecranal region dark brown while 
others are white with brown tips ; humeral feathers also dark brown ; rump and 
upper tail -coverts white ; a patch on each side of the breast grey, like the back ; 
a pale grey hne in front and over the eye ; head and neck all round, mantle and 
entire under-surface white, as also the axillaries ; under wing-coverts white, those 
around the margin dark brown ; bill black, culmen yellow, passing into orange 
at the tip ; a line at the base of the mandible yellow ; legs flesh-colour. Total length 
710 mm. ; culmen 118, wing 464, tail 190, tarsus 75. ' 
Adult female. Similar to the adult male. 
Nest, Egg, and Breeding-season. Unknown. 
Apparently nothing is known regarding the life-history or breeding-place of 
this bird. 
The plate is lettered Diomedea chlororhynchus. 
281 
