Page:Birds of North and Middle America partV Ridgway.djvu/82

54

a. Pileum and hindneck at least partly slate color or slate-gray. (Adult males.)
 * b. Pileum and hindneck without black or white markings.
 * c. A narrow white spot or streak on lower edge of auricular region. (Southwestern Brazil; Bolivia?)

'Dysithamnus affinis, adult male (extralimital).
 * cc. No trace of white spot or streak on lower edge of auricular region. (Dysithamnus mentalis.)
 * d. Under parts of body more deeply yellowish, strongly and abruptly contrasted with grayish white of throat. (Southeastern Brazil; Paraguay.)

Dysithamnus mentalis mentalis, adult male (extralimital).
 * dd. Under parts of body paler yellowish (sometimes white).
 * e. Abdomen more or less yellowish; back more or less olivaceous, different from color of pileum and hindneck.
 * f. Larger (wing 63.5-66.5).
 * g. Paler. (Tobago.)

Dysithamnus mentalis oberi, adult male (extralimital).
 * gg. Darker. (Colombia and Venezuela.)

Dysithamnus mentalis semicinereus, adult male (extralimital).
 * ff. Smaller (wing 57-62). (Panama to Guatemala.)

Dysithamnus mentalis septentrionalis, adult male (p. 55).
 * ee. Abdomen white; back slate color, concolor with pileum and hindneck.
 * f. Lighter and clearer slate color above, more extensively white beneath, the flanks paler and less olive or buffy brownish. (Trinidád.)

Dysithamnus mentalis andrei, adult male (extralimital).