Page:Birds of North and Middle America partV Ridgway.djvu/38

10 a. Planta tarsi compressed and more or less sharply ridged behind, consisting of two parallel rows of scutella or undivided lamina, whose line of contact forms a median posterior ridge. (Formicariinæ.)
 * b. Second phalanx of middle toe entirely free from outer toe; acrotarsium more or less distinctly scutellate (at least on inner side).
 * c. Nostril oval or roundish, pierced directly into the completely ossified nasal fossæ, without trace of operculum or adjacent membrane. (Thamnophileæ.)
 * d. Bill more swollen and relatively shorter and broader, its depth at frontal antiæ much more than one-third the length of the commissure.
 * e. Tail shorter than wing; tarsus shorter than commissure; plumage narrowly barred, above and below

Cymbilaimus (p. 18).
 * ee. Tail much longer than wing; tarsus longer than commissure; plumage spotted above, nearly unicolored (not barred) below.

Hypœdaleus (extralimital).
 * dd. Bill less swollen, relatively longer and narrower, or else more compressed, its depth at frontal antiæ much less than one-third the length of commissure.
 * e. Tail much longer than wing.
 * f. Bill relatively longer (exposed culmen longer than middle toe without claw), much stronger, less tapering terminally, the unguis larger and more abruptly hooked; upper parts transversely barred; very large (total length 300 mm. or more)

Batara (extralimital).
 * ff. Bill relatively smaller (exposed culmen not longer than middle toe without claw), much weaker, more tapering terminally, the unguis smaller and weaker; upper parts spotted (not barred) or immaculate; smaller (total length not more than 250 mm.).