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The four other specimens in darker immature pelage are plumbeous and cinnamon whereas immature individuals of comparable age of Peromyscus banderanus caught in the same place are plumbeous above and lack the cinnamon color.

Description.—Above uniform ferruginous, lores paler; beneath lighter, belly yellowish; bill horn-colour, yellowish at the base; feet plumbeous: whole length 6·8 inches, wing 3·4, tail 3·1.

Description.—Above grey; head above, wings, and tail plumbeous black; beneath white, neck and sides of belly striped with black: whole length 36·0 inches, wing 18·0, tail 7·0.

Similar to No. 334, but Ad. dark plumbeous above, markings on lower parts heavier and darker.

The researchers counted and recorded plumbeous vireos and grey vireos living near natural gas wells with noisy compressors.