480 Letters, Extracts, Announcements, &c. 
(Bull. iv. pp. 1-66), and contains an account of his collections 
made during a second visit to this interesting region, situated 
on the United-States and Mexican frontier. Mr. Sennett 
was able to add five species to the United-States fauna, all 
of them known Mexican birds. Of these species Dr. Coues 
has given very copious references, and added some valuable 
notes on them, as well as other species mentioned in the 
paper. 
L.—Letters, Extracts, Announcements, &c. 
We have received the following letter addressed to the 
Editors of ‘ The Ibis’ — 
S1rrs,—I am inclined to think that a notice of the occurrence 
of that curiously local species Larus audouini in (as far as I 
know) a new locality may possess some interest for your 
readers, and therefore proceed to lay some of the particulars 
thereof before you. As I have already mentioned the precise 
locality of this occurrence to several of my brethren of the 
B.O. U., I think that in the interests of a rare species you will 
excuse me from indicating it further than by stating that it is 
an island of the dominions of the Spanish crown in the Medi-. 
terranean, some fifty or more miles from the nearest mainland 
or island, and is uninhabited, except by the keepers of a light- 
house erected within the last few years. We approached this 
island in my aux.s.s. yacht ‘Glowworm’ towards the close of 
a fine, perfectly calm day, April 26th, 1879, having left 
our port, about ninety miles distant, about 9 4.m. We saw 
nothing remarkable on our course except an occasional pass- 
ing Shearwater and a distant Gull or two; but about 4 P.m., 
when within a few miles of the island, we had some eight or 
ten of the largest Cetaceans which I have seen in the Medi- 
terranean in full view at the same time, blowing, spouting, 
and playing within a mile of our vessel, and attended by 
many Gulls. J may mention that I had reason to expect 
Audouin’s Gull, and that my visit to the island was princi- 
pally caused by that expectation ; but the Gulls in attendance 
