62 University of California Publications in Zoology  [Vow. 30

Gavia immer Briinnich. Common Loon
Seen on most of the lakes, and presumably nests in the region. No
evidence of breeding was found, however, other than the presence of
loons, some in pairs, throughout the summer.

Gavia pacifica (Lawrence). Pacific Loon
Seen at Careross, presumably migrating, on May 22. The presence
of a pair of Pacific loons on a small lake a few miles north of Atlin,
on June 23 and 24, led to the hope that they would nest there. A few
days later, however, they were gone, and no others were seen.

Gavia stellata (Pontoppidan). Red-throated Loon
Seen on but one occasion, a single bird on Lake Atlin on June 20.

Stercorarius parasiticus (Linnaeus). Parasitic Jaeger
One seen in pursuit of a gull at Lake Teslin, September 11. The
jaeger was at close enough range to permit observation of details of
color and markings.

Larus argentatus Pontoppidan. Herring Gull

A nesting colony of this species on an island in Atlin Lake has
been described by Anderson (1915, p. 9). Herring gulls were seen
commonly along the shore of Atlin Lake all through the summer, at
Surprise Lake in August, and at Teslin Lake during the second week
in September. Herring gulls raided certain breeding colonies of short-
billed gulls, Bonaparte gulls, and Arctic terns near the town of Atlin,
to such effect that only an extremely small proportion of the young of
those species survived.

There is a published record of the occurrence of Larus californicus
at Lake Atlin (Anderson, 1915, p. 9), based upon a specimen in the
collection of the Provincial Museum, Victoria. I have examined this
specimen, which proves to be, though a rather small individual,
unquestionably Larus argentatus.

Larus brachyrhynchus Richardson. Short-billed Gull

Seen at Carcross, May 22. A small nesting ‘‘colony,’’ consisting
of at least four pairs and perhaps seven or eight, was distributed over
the three islands nearest the town of Atlin. Short-billed gulls were

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