Dr. Walter P. Taylor (MS.) says of a song heard at Fort Valley, Ariz., on June 12, 1925: "The song seems much less full and seems lacking in quality, as compared with that of the Audubon in Washington State. It was so lacking in strength and quality that I took it for a Grace warbler." He wrote it as _wheetlea, wheetlea_, repeated 7 or 8 times, or _wheetoo_, 7 times repeated, or again _wheetleoo wheet_, the final syllable a little different from the others. Mrs. Bailey (1902) says: "His song is of a strong warbler type, opening toward the end, _chwee, chwee-chwee-ah, chwee_, between the song of the yellow warbler and that of the junco." At Lake Burford, N. Mex., in May and June, according to Dr. Wetmore (1920), "males were found singing from the tops of the tallest pines and were slow and leisurely in their movements in great contrast to their habit at other seasons. Frequently while singing they remained on one perch for some time so that often it was difficult to find them. The song resembled the syllables _tsil tsil tsil tsi tsi tsi tsi_. In a way it was similar to that of the Myrtle Warbler but was louder and more decided in its character." Dr. Merrill (1888) says: "On two or three occasions I have heard a very sweet and peculiar song by the female, and only after shooting them in the act of singing could I convince myself of their identity." _Field marks._--The male in his gay spring plumage is not likely to be confused with any other warbler except the myrtle warbler, from which it differs in having a brilliant yellow throat instead of a white one; in other words, _auduboni_ has five patches of yellow against four for _coronata_. In immature and fall plumages the two species are much alike, but _auduboni_ has four or five large white patches on each side of the tail, while _coronata_ has only two or three, in the different plumages; these white markings are diagnostic in any plumage. The yellow rump is always conspicuous at any season, even when the other yellow markings are more obscured. _Fall._--The fall migration is a reversal of the spring migration, from the north southward and from the mountains down to the valleys and lowlands. Rathbun tells me that the southward migrants pass through Washington during October and November, but that a few remain there and even farther north, in winter. In California, Audubon's warblers that have bred in the mountains begin to drift downward to lower levels in August, the young birds coming first, so that by September they are well spread out over the lowlands almost down to sea-level. Soon after the first of October, the first of the migrants cross the border into Mexico on their way to winter quarters. Dr. Taylor tells me that in New Mexico during October these warblers are abundant in the aspens, being "by far the most numerous species of bird."