312 Swartu, Marsh Wrens of California. [ae 
Whether the breeding ground also extends northward in the 
Sacramento Valley, remains to be demonstrated. Three winter 
birds at hand from the coast of Oregon, apparently referable to 
estuarinus, point to the possibility of a breeding ground farther 
north and nearer the point of capture than is the Suisun region. 
Of these three specimens just one is fairly typical of @stuarinus 
in appearance, the others tending toward paludicola. Possibly 
all three are merely variants of the latter race, showing individual 
variation towards estuarinus. 
There are also at hand, as listed above, a few individuals appar- 
ently of this race, from Palo Alto, San Luis Obispo, and various 
points in the San Diegan region, taken from October to December. 
This is indicative of a slight migratory movement, or rather a 
scattering of individuals slightly beyond the breeding confines. 
Certain of the specimens from the San Diegan region are not 
absolutely typical, and may be representative of the form as it 
occurs in the southern San Joaquin Valley. 
Conditions on the Pacific Coast are such as to render it not so 
much a matter of surprise that three races of marsh wren should 
now be recognized from California, as that the species should not 
be found to have split up into a greater number of forms. Suitable 
breeding grounds for birds of this nature are limited in area and 
isolated at widely separated points. The Pacific Coast marsh 
wrens, with the exception of plesius, are not markedly migratory 
in habit, and it would seem fair to suppose that these several 
factors would produce more conspicuous results in differentiation 
of races than has actually taken place. On the Atlantic Coast 
of the United States less apparent differences of environment, in a 
region otherwise not noticeably productive of geographical variants, 
‘are accompanied by strikingly differentiated. local races of the 
same species. 
Telmatodytes palustris paludicola (Baird). 
Type locality— Shoalwater Bay, Washington. 
Range in California.— Resident locally in marshy tracts. In northern 
California, the region west of the coast ranges; south of San Francisco Bay, 
along the coast, in the Santa Cruz and San Diegan regions, probably to the 
Mexican boundary line. There are no specimens of this subspecies at hand 
