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BIRDS OF NORTH AND MIDDLE AMERICA.
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- f. Tail much shorter than wing (not more than three-fourths as long, usually much less).
- g. Tail little if any more than half (sometimes much less than half) as long as wing.
- h. Bill small and very slender, the exposed culmen shorter than middle toe without claw
- g. Tail little if any more than half (sometimes much less than half) as long as wing.
- f. Tail much shorter than wing (not more than three-fourths as long, usually much less).
Rhopias (extralimital).[1]
- hh. Bill larger and stouter, the exposed culmen longer than middle toe without claw.
- i. Planta tarsi scutellate on each side; maxilla slightly decurved terminally; gonydeal angle very slight; plumage streaked; no white band across rump
- hh. Bill larger and stouter, the exposed culmen longer than middle toe without claw.
Myrmotherula (p. 60.)
- ii. Planta tarsi scutellate on posterior portion of outer side only; maxilla straight throughout (only the extreme tip decurved); gonydeal angle prominent; plumage spotted; a white band across rump
Dichrozona (extralimital).[2]
- gg. Tail much more than half to more than two-thirds as long as wing.
Myrmopagis (p. 65).
- f. Tail nearly as long as wing, sometimes longer.
- g. Nostril slit-like, much narrower than the broad operculum; tarsus nearly half as long as wing. (Rectrices 10.)
- h. Rictal bristles obsolete; feathers of chin and forehead without trace of terminal setæ; tarsus much less than twice as long as middle toe without claw, the plantar scutella very distinct on both sides.
- g. Nostril slit-like, much narrower than the broad operculum; tarsus nearly half as long as wing. (Rectrices 10.)
- f. Tail nearly as long as wing, sometimes longer.
Rhoporchilus (extralimital).[3]
- hh. Rictal bristles obvious (though small); feathers of chin and forehead with distinct terminal setæ; tarsus twice as long as middle toe without claw, the plantar scutella indistinct (especially on inner side)
Myrmorchilus (extralimital).[4]
- gg. Nostril broadly oval, much broader than the narrow (sometimes obsolete) operculum; tarsus less than half as long as wing.
- h. Rectrices 12.
- i. Pileum not black, or else back and rump also black; back, scapulars, and rump brownish slate, brown, rufescent, or black, concolor with pileum; adult male with at least chin, throat, chest, and part of breast black
- h. Rectrices 12.
- gg. Nostril broadly oval, much broader than the narrow (sometimes obsolete) operculum; tarsus less than half as long as wing.
Microrhopias (p. 75).
- ii. Pileum (in adult male) black, conspicuously contrasted with bluish gray of back, scapulars, and rump; chin and throat
- ↑ Rhopias Cabanis and Heine, Mus. Hein., ii, 1859, 13. Type, Thamnophilus gularis Spix. (Southeastern Brazil; monotypic?) [Possibly Myrmothera guttata Vieillot (Myrmotherula guttata Sclater), of Cayenne and Guiana, may be congeneric, but I have not been able to examine that species.]
- ↑ Dichrozona Ridgway, Proc. U. S. Nat. Mus., x, sig. 33, Aug. 6, 1888, 524, footnote. Type, D. zononota Ridgway = Cyphorinus (Microcerculus) cinctus Pelzeln.
- ↑ Rhoporchilus Ridgway, Proc. Biol. Soc. Wash, xxii, April 17, 1909, 69. Type, Formicivora speciosa Salvin. (Western Ecuador; monotypic.) The type species has been placed in both "Formicivora" (Drymophila) and Synallaxis, but is very distinct from either.
- ↑ Myrmorchilus Ridgway, Proc. Biol. Soc. Wash., xxii, April 17, 1909, 69. Type, Myiothera strigilata Maximilian. (Southeastern Brazil; monotypic.)
