524 MR. H. SAUNDERS ON LARID [June 6, 
mantle ashy brown, the tips of the feathers margined with white ; 
upper wing-coverts and secondaries white ; primaries, ]—5 black with 
greater part of inner web white, 6 and 7 white barred with dusky, 
8-10 pure white. Tail much forked, the outer feathers nearly 
white, the others banded with brown and tipped with white ; ramp 
white slightly mottled with brown. Underparts white. Bill horn- 
black ; tarsi and feet livid brown. The bill is proportionately 
longer, slenderer, and more curved than in X. sabini, from which 
it also differs in having a considerable bare space between the base 
of the feathers and the nares. ‘The first primary which shows the 
slightest tip of white is the 5th, and there is less white at the tips of 
the upper ones than in the young of X. sabinii. 
The feathers are all quite fresh, and, reasoning from analogy, I 
should think that this example cannot have been more than three 
or four months old.: Where, then, are the head-quarters of this 
mysterious Gull? It would seem by this specimen that its breeding- 
time corresponds to that of the northern hemisphere, and that, 
like some other Gulls, it passes southwards to escape the northern 
winter; but as yet nothing is known. It is, however, somewhat 
remarkable that American naturalists who have devoted so much 
attention to the exploration of the coast of the Pacific, from Van- 
couver’s Island down to Mexico, have discovered no trace of it; 
nor have repeated visits to the Galapagos produced more than the 
isolated adult specimen above noticed. Capt. Markham’s valuable 
acquisition has now made us acquainted with the first plumage of 
this extremely rare bird; and the proof of the existence of this long- 
lost species may be expected to awaken an interest which will pro- 
bably in a few years lead to the discovery of its real habitat. 
XeEMA SABINIT (Sabine). 
Larus sabini, J. Sabine, Tr. Linn. Soe. xii. p. 520 (1818). 
Xema sabinii (Sabine), Saunders, P. Z.S. 1878, p. 209. 
[Nos. 70 & 71 (3 9), Callao Bay, Dec. 1881. Eyes black.] 
Two specimens of this circumpolar species in the winter plumage of 
the second year : 7. e. adult, but without the hood. In the primaries 
the white bottoms of the tips are so completely worn away as to give 
them the appearance of having been cut off squarely, showing that 
these flight-feathers are not renewed until January or February, as 
in the case of many of the Terns. 
The occurrence of this species at Callao, in 12° S., further increases 
our knowledge of its winter range on the Peruvian coast, the most 
southern locality hitherto recorded being Tumbez in about 8° S. 
(Scl. & Salv. P. Z.S. 1878, p. 141), on the authority of Prof. Steere. 
On the Atlantic side this species has not yet been recorded as an 
autumn and winter visitant beyond the coast of France and the 
Bermudas. 
Larus FRANKLINI, Sw. & Rich. 
Larus franklini, Sw. & Rich. F. Bor.-Am., Birds, p. 424 (1831) ; 
Scl. & Salv. P.Z. 8. 1861, p. 577; Saund. op. cit. 1878, p. 195 
[No. 11, no, 12 (2), no, 18( 3), no. 14 (2), Coquimbo Bay, 
