The Western Savanna Sparrow is a common species throughout the Western Province of North America, from the plains to California, and from Alaska to Mexico. In California it appears to be replaced along the Pacific coast by the variety anthinus, a quite different and very local form. In Alaska, specimens were obtained by the naturalists of the Russian Telegraph Expedition at various localities, chiefly in the interior, and on the Yukon it was obtained by Mr. Lockhart. Dr. Cooper found it at Fort Steilacoom, in Washington Territory, where it was in company with P. sandwichensis, in the wet meadows. In California this species inhabits chiefly, according to Dr. Cooper, the dry plains of the interior of the State. The statement of the occurrence of this form anywhere along the coast of California should be received with considerable doubt, since in the large series of these birds all specimens from this region are of the variety anthinus, an exclusively littoral type.
Habits. The Western Savanna Sparrow was found throughout the Great Basin, by Mr. Ridgway, in all wet, grassy situations, in which preference it is like its eastern relative. It was very abundant at Carson City, inhabiting exclusively the meadows. At Salt Lake City it was also very abundant, frequenting the wet meadows near the Jordan.
This bird was also obtained at Sitka by Bischoff, and was found on the Yukon by Mr. Lockhart. It is the only species found in the Valley of the Mackenzie, up to the Arctic coast.
Dr. Cooper also met with it among the low meadows of Washington Territory,
where they arrived in March, and remained until late in October. They were usually found among the grass, from which they rarely rise, except to sing their faint and lisping trill from a weed or some low bush. Mr. Ridgway represents this song as corresponding with the syllables witz-witz-wih´-tzull. This, he states, is uttered in a weak and lisping manner, as the bird perches on a bush beside the brook, or on a fence, or as it nestles among the grass on the ground.
Dr. Cooper speaks of them as only winter visitants in California, and there residing only on the dry interior plains, as far south as San Diego, where they remain in large flocks until April. He has never met with this bird during the summer months, though some are supposed to remain and breed in the high prairies. He did not meet with any about the summits of the Sierra Nevada, in September. They appeared to prefer the dry rolling prairies to marshes, though they were occasionally found in the latter.
This species is also a migratory visitant to the Department of Vera Cruz, Mexico, where they are said by Sumichrast to pass the winter.
Their nests are built upon the ground, and are composed almost entirely of the dry stems of grasses, and are lined with finer materials of the same. Their eggs measure .75 of an inch in length by .52 in breadth, have a greenish-white ground, over which are distributed numerous markings, spots, and blotches of various sizes, of a light purplish-brown and a deeper red-brown, confluent about the larger end, where they form a crown.
Near Fort Anderson nests were found in great numbers, no less than two hundred and four having been obtained during four summers in that locality. These nests were all taken on the ground, under low grass, in dry spots in a large marshy prairie, and it is stated that they were never found in any other situation or locality.
Passerculus savanna, var. sandwichensis, Baird.