Page:Birds of North and Middle America partV Ridgway.djvu/241

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a. Throat and upper chest strongly rufescent (tawny to chestnut); no trace of supra-auricular streak.
 * b. Wings deep russet or chestnut-brown, more rufescent than back.
 * c. Tail clear chestnut or rufous-chestnut.
 * d. Pileum and hindneck decidedly darker and more chestnut brown than back.
 * e. Throat and upper chest deep cinnamon-rufous or rufous-chestnut (whole of under parts darker). (Southeastern Mexico.)

Automolus rubiginosus (p. 214).
 * ee. Throat and upper chest tawny-ochraceous to rufous-tawny (whole of under parts lighter). (Automolus veræpacis.)
 * f. Pileum and hindneck dark vandyke brown or seal brown, back deep vandyke brown, throat and upper chest rufous-tawny. (Central Guatemala.)

Automolus veræpacis veræpacis (p. 214 ).
 * ff. Pileum and hindneck light vandyke or deep russet brown, back deep tawny-brown, throat and upper chest tawny-ochraceous. (Western Guatemala.)

Automolus veræpacis umbrinus (p. 215).
 * dd. Pileum and hindneck tawny-brown or russet-brown, concolor with back. (Southwestern Mexico.)

Automolus guerrerensis (p. 216).
 * cc. Tan dark chestnut (otherwise very much like A. guerrerensis). (Santa Marta district of Colombia.)

Automolus rufipectus (extralimital).
 * bb. Wings deep sooty brown, concolor with back. (Western Panamá.)

Automolus fumosus (p. 216). aa. Throat buff, chest buffy or light buffy grayish; a more or less distinct supra-auricular streak of buffy.
 * b. Supra-auricular streak distinct; feathers of upper chest more or less distinctly margined with darker; under wing-coverts tawny-ochraceous; under tail-coverts more or less strongly rufescent. (Automolus cervinigularis.)
 * c. Coloration more rufescent above, darker and more buffy below, the buff of throat merging gradually into the dull brownish buff or clay color of chest, etc. (Southeastern Mexico to eastern Nicaragua.)

Automolus cervinigularis cervinigularis (p. 217).
 * cc. Coloration less rufescent (more olivaceous) above, darker and more olivaceous below, the buff of throat abruptly contrasted with the buffy olive of chest, etc. (Eastern Costa Rica; western Panamá?)

Automolus cervinigularis hypophæus (p. 219).
 * bb. Supra-auricular streak indistinct; under wing-coverts ochraceous-buff; feathers of chest without darker margin; under tail-coverts slightly if at all rufescent. (Automolus pallidigularis.)
 * c. Coloration slightly darker above (back deep olive-brown); chest indistinctly flammulated with pale buffy. (Eastern Panamá; Colombia?; Ecuadór?)

Automolus pallidigularis pallidigularis (p. 220).
 * cc. Coloration slightly paler above (back lighter and more olivaceous brown); chest uniform pale buffy grayish brown. (Western Panamá and western Costa Rica.)

Automolus pallidigularis exsertus (p. 221).