Page:Birds of North and Middle America partV Ridgway.djvu/200

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a. Breast plain brown, brownish, gray, or grayish olive. (Xenops genibarbis.)
 * b. Basal portion of rectrices more extensively black. (Tropical South America.)

Xenops genibarbis genibarbis (extralimital).
 * bb. Basal portion of rectrices less extensively black. (Southern Mexico to Panama.)

Xenops genibarbis mexicanus (p. 172.) aa. Breast conspicuously streaked with whitish. (Xenops rutilus.)
 * b. Under parts more broadly streaked; back, etc., brighter rufous-brown. (Brazil, etc.)

Xenops rutilus rutilus (extralimital).
 * bb. Under parts more narrowly streaked; back, etc., duller rufous-brown. (Costa Rica to Colombia, Venezuela, Trinidad, and Peru.)

Xenops rutilus heterurus (p. 175).

XENOPS GENIBARBIS MEXICANUS (Sclater).

Similar to X. g. genibarbis but with much less of black on basal portion of lateral rectrices.

Adults (sexes alike). — Pileum brown (nearly bister), the feathers sometimes with very indistinct shaft-streaks of paler (these usually