20 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Larus occidentalis Aup. 
WESTERN GULL. 
Larus occidentalis BELDING, Proc. U. 8. Nat. Mus., V. 1885, 545 (Cape Region), 549 
(San José). Bryant, Proc. Calif. Acad. Sci., 2d ser., II. 1889, 251 (Cape 
Region). 
The Western Gull is resident along the Gulf coast of the Peninsula and is very 
common in places, especially in the Bay of La Paz, in winter. Mr. Frazar found 
a breeding colony of about twenty-five pairs on a small rocky island a little to 
the westward of Carmen Island. Most of the nests were only just begun, and 
but two contained eggs, one set, however, comprising the full complement of 
three. This was on March 13, a date about two months earlier than that at 
which the first eggs are usually taken on the Farallon Islands near San Fran- 
cisco. The next day another breeding ground was discovered on the northern 
end of the island of Montserrat. Here some fifty pairs had congregated. Few 
of their nests were finished and only eight contained eggs, the number in each 
set varying from one to three. At both of the places just mentioned, the nests, 
which were made of seaweed, were built at the foot of the cliffs just above high- 
water mark and often in nooks or crevices. 
Mr. Bryant notes the Western Gull as “ tolerably common at Magdalena 
Bay in winter, and northward along the western coast,” adding that it is “ said 
to breed upon the Todos Santos Islands off Ensenada.” Mr. Goss states 1 that 
a few nest on San Pedro Martir Isle. 
The general range of this species includes practically the entire Pacific coast 
of North America. 
Larus californicus Lawr. 
CALIFORNIA GULL. 
Larus californicus Betpinc, Proc. U. S. Nat. Mus., V. 1883, 549 (San José). 
Bryant, Proc. Calif. Acad. Sci., 2d ser., II. 1889, 251 (San José del Cabo). 
Mr. Frazar notes this Gull as ‘common in winter at La Paz,” and also met 
with between Loreto and Carmen Island on March 13, but his collection 
contains no specimens. Mr. Belding records it as “ moderately common,” and 
mentions seeing it at San José del Cabo as late as May 17. There is no proba- 
bility, however, that it breeds anywhere in or near Lower California. My. 
Bryant “obtained immature birds at Magdalena Bay in the winter,” but does 
not mention finding the species at any other locality. 
The California Gull has occurred in winter on the western coast of Mexico as 
far southward as the Rio de Coahuayana, Colima. It is also a common winter 
1 Auk, V. 1888, 241. 
