Page:Birds of North and Middle America partV Ridgway.djvu/193

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 * dd. Back., etc., deep chestnut-brown or vandyke brown; chest clear chestnut. (Costa Rica and western Panamá).

Sclerurus canigularis (p. 166).
 * bb. Chin and throat bright russet or rufous-tawny, like chest. (Sclerurus mexicanus.)
 * c. Coloration lighter, the back, etc., warm-sepia brown, the lower rump and upper tail-coverts chestnut. (Southeastern Mexico to Amazon Valley.)

Sclerurus mexicanus mexicanus (p. 166).
 * cc. Coloration darker, the back, etc., dark sepia brown, the lower rump and upper tail-coverts deep vandyke to deep chocolate or walnut brown. (Caribbean slope of western Panamá and eastern Costa Rica.)

Sclerurus mexicanus pullus (p. 168). aa. Lower rump and upper tail-coverts similar in color to back or but slightly more rufescent.
 * b. Chin and throat tawny or russet, like chest. (Guiana and lower Amazon Valley.)

Sclerurus caudacutus (extralimital).
 * bb. Chin and upper throat with basal portion of feathers whitish or very pale brownish, the tip or terminal margin dark brown or dusky.
 * c. General color umber or sepia brown.
 * d. Throat brown, with basal portion of feathers dull brownish white or very pale brownish. (Upper Amazon Valley.)

Sclerurus fuscus (extralimital).
 * dd. Chin and upper throat white, the feathers tipped or margined with brown or dusky.
 * e. Chest without spots or distinct streaks of tawny, and general coloration lighter brown.
 * f. General color deep chocolate brown; smaller (wing 83 8-86.4, tail 53.3-58.4). (Colombia.)

Sclerurus brunneus (extralimital).
 * ff. General color vandyke brown, more olive-brown on under parts, the sides of head and neck and upper chest brownish tawny; larger (wing 100.3, tail 78.7). (Southeastern Brazil.)

Sclerurus lawrencei (extralimital).
 * ee. Chest with distinct streaks or spots of tawny, and general color much darker brown. (Southern Mexico to Panamá; western Ecuadór?).

Sclerurus guatemalensis (p. 169).
 * cc. General color olivaceous. (Western Peru.)

Sclerurus olivascens (extralimital).