Page:Birds of North and Middle America partV Ridgway.djvu/43

Rh ::::::::: jj. Rictal region feathered, postocular region partly naked smaller forms (total length about 100 mm.) with coloration much variegated Hypocnemis (extralimital).
 * ii. Frontal or loral regions, or both, scantily feathered (sometimes quite bare).
 * j. Loral and suborbital regions (sometimes forehead and crown also) bare or but scantily bristled; adult males uniform black (with white markings on wing-coverts).

Gymnocichla (p. 97).
 * jj. Loral and suborbital regions feathered (only the postocular and rictal regions naked); adult males not black (or else without white markings on wing-coverts).
 * l. Tail less than four-fifths as long as wing; bill stouter; nostrils smaller, more rounded; forehead more thinly feathered, the feathers semi-decomposed, semi-erect.

Myrmeciza (p. 103).
 * ll. Tail more than five-sixths as long as wing (sometimes longer than wing); bill more slender; nostrils larger, more longitudinal; forehead more densely feathered, the feathers more compactly webbed, decumbent.

Myrmoderas (extralimital).
 * dd. Plumage harder, very dense and compact, only the tail-coverts semi-decomposed or loose webbed. (Formicarieæ.)
 * e. Tail less than two-thirds as long as wing; plumage of rump not abnormally long and dense; feathers of latero-frontal antiæ short and dense, not antrorse, not extending above nostril; bill relatively longer and less depressed basally, the exposed culmen as long as middle toe without claw; under parts neither streaked nor barred.

Formicarius (p. 115).
 * ee. Tail more than two-thirds as long as wing; plumage of rump very long and dense; feathers of latero-frontal antiæ longer, antrorse, extending anteriorly, above the nostril, to anterior end of nasal fossæ; bill relatively shorter and more depressed basally, the exposed culmen much shorter than middle toe without claw

Chamæza (extralimital).