300 LAEIDiE. 



Gay, Hist. Chile, Zool. i. p. 654 (1847) ; Reichenb. Natatores, tab. 



XXV. fig. 847 (1848). 

 Leucophaeus hsematorhynchus, Bruch, J. f. 0. 185.3, p. 108 ; id. 



op, cit. ]855, p. 287"; Bp. Naum. 1854, p. I'll ; id. C. R. xlii. 



p. 771 (1856). 

 Chroicocephalus hfematorhynchus, Licht. Nomencl. Av. p. 98 



(1854: Chile). 

 Procellarus neglectus, site Epitelarus neglectus, Bp. Naum. 1854, 



pp. 211, 213; id. Rev. et Mag. Zool. 1855, p. 13; id. C. R. xlii. 



p. 770 (1856) ; id. Consp. Av. ii. p. 211 ( 1857 : type of genera). 

 Leucophaeus scoresbii, Bp. Consp. Av. ii. p. 231 (1857) ; Bias, 



J.f. O. 1865, p. 378; Scl. 8)- Salv. P. Z. S. 1871, p. 579; iid. 



Nomencl. Av. Neotr. p. 148 (1873). 



Adult male in breeding -plumage. Head, neck, and under surface 

 lavender-grey, a little warmer on the upper parts, especially on 

 the neck, where the grey deepens ; mantle black, scapulars and 

 secondaries very broadly tipped with white ; primaries chiefly black, 

 the 2nd with a minute white tip, the 3rd with more white termi- 

 nally, and so on, until at the 5th a white spot appears on the inner 

 web, and by contrast forms the black into a subterminal bar ; 

 succeeding quills with broad white tips, which increase in size 

 upwards ; tail-coverts pale grey ; rectrices pure white ; under wing 

 smoke-grey : bill " arterial red " or bright cherr3'-colour ; iris pale 

 yellow, orbital ring white; tarsi and toes vermilion. Total length 

 18 inches, culmen 1"7, depth at angle 0-6, wing 13-25, tail 6, 

 tarsus 2, middle toe with claw 2 ; hallux joined to the inner toe by 

 a distinct web. 



'Yhe female appears to be slightly smaller, but examples with the 

 sex determined are few. 



Young. Head smoke-grey ; neck all round brownish ; feathers of 

 the mantle dark brown, with paler tips ; secondaries almost as 

 broadly tipped with white as in the adult ; quills black, without 

 white tips up to the 5th ; tail-coverts nearly white ; rectrices 

 white, with a broad black subterminal band ; under surface nearly 

 white up to the brea.st, which is brownish like the neck : bill 

 ochre-yellow at the base, blackish anteriorly ; tarsi and toes livid 

 brown. 



In the next stage the head is sooty, giving the appearance of a 

 very distinct hood by contrast with the neck, which is grey ; mantle 

 blackish in the centre ; the bar on the rectrices smaller and the 

 two outer pairs of feathers almost white ; under surface pale grey. 

 Immature. With a strongly marked hood ; otherwise like the 

 adult, except that there is less white on the primaries and the 6th 

 has a narrow subterminal black bar. 



Nestling. Stone-grey, very closely spotted above and mottled 

 below with blackish : altogether a very dark bird. 



This is a very localized and terrestrial Gull, subsisting largely 

 on the eggs and young of other birds during the season, molluscs, 

 &o. In its plumage it forms a remarkable link between the Pacific 

 group and the typical Gulls. 



