Page:Birds of North and Middle America partV Ridgway.djvu/145

Rh

a. Pileum and hindneck rufescent or tawny, conspicuously different, from color of back; outer web of exterior feather of alula light tawny or buff.
 * b. Forehead bright tawny or rufescent, like crown, etc. (Southeastern Brazil.)

Formicarius colma (extralimital).
 * bb. Forehead black or dusky. (Amazon Valley to Cayenne and Colombia.)

Formicarius nigrifrons (extralimital). aa. Pileum dull brownish, not very different from color of back, or else black; outer web of exterior feather of alula grayish brown.
 * b. Chest black, brownish gray, or slaty.
 * c. Sides of neck similar in color to hindneck, not rufescent or cinnamomeous.
 * d. Pileum brown, like back, with only centers of feathers blackish; chest slate-gray in contrast with black of throat. (Bolivia to northeastern Peru.)

Formicarius analis (extralimital).
 * dd. Pileum and chest black. (Costa Rica and western Panamá.)

Formicarius analis nigricapillus (p. 118).
 * cc. Sides of neck rufescent or cinnamomeous. (Formicarius moniliger.)
 * d. Under tail-coverts only partly, if at all, rusty, tawny, or cinnamomeous, the longer (posterior) ones being dusky margined with brown.
 * e. A distinct rusty or cinnamomeous collar across foreneck.
 * f. Darker, the back, etc., bright mummy brown to chestnut-brown, the chest sooty slate-gray. (Southeastern Mexico, except Yucatan, to Guatemala)

Formicarius moniliger moniliger (p. 119).
 * ff. Paler, the back, etc., raw-umber to light olive-brown, the chest mouse gray to drab-gray.