_Eggs._--Either 3, 4, or 5 eggs are the numbers in the few recorded sets. The 5 eggs in the Thayer collection are ovate and have only a slight gloss. The white ground color is speckled and spotted with tones of "bay," "auburn," "chestnut brown," "Mars brown," or "russet," with undertones of "pale brownish drab," or "vinaceous drab." Some of the eggs have markings of two or three shades of the darker browns, such as "bay," or "auburn," while others have tones of a single lighter brown, such as "russet," interspersed with the drab spots. There is not a well defined wreath on any of these eggs, although the spots are denser at the large end. The measurements of 40 eggs average 17.4 by 12.9 millimeters; the eggs showing the four extremes measure =19.0= by 12.7, 17.3 by =13.6=, =15.2= by 12.7, and 17.4 by =12.3= millimeters (Harris). _Plumages._--Maj. Allan Brooks (1934) gives the following good description of the juvenal plumage of Townsend's warbler: "Upper surface brownish olive, greener on dorsum and grayer on crown; lores and auriculars dusky brown, a broad supercilium and malar stripe whitish, faintly tinged with yellow; chin and throat dusky olive gray passing into white on the ventral region and crissum, the flanks and breast streaked with dusky; wings with two white bars formed by the tips of the greater and lesser coverts, tertials edged with ash gray, the black central shafts of the white bars seen in the second (first winter) plumage are barely indicated; tail as in second plumage." Evidently the juvenal plumage is worn for only a very short time, for in the bird thus described, collected on July 7, "a few yellow feathers of the second plumage are appearing." Apparently, the postjuvenal molt is completed in July and August, and involves the contour plumage and the wing coverts only. The young male in first winter plumage is similar to the old male at that season, but with less black on the head and throat, cheeks more olive, black streaks on back and sides obsolete, and yellow of the throat paler. The young female differs from the adult female in a similar way. There is evidently a partial prenuptial molt in late winter or early spring, but I have not been able to trace it. Apparently the black throat is acquired by the young male at this molt, and perhaps enough of the head and body plumage to make the young bird appear nearly adult, though the worn and faded juvenal wings and tail will distinguish it.