_Description._--Above, earthy brown; cap chestnut; front earthy brown; wing-coverts chestnut, wing-feathers olive-brown, the outer webs edged with chestnut; tail chestnut; beneath, throat blackish, with slight whitish mottlings; breast, sides, and under tail-coverts pale earthy brown, belly brownish white; under wing-coverts fulvous; bill and feet horn-colour: whole length 5·6 inches, wing 2·2, tail 3·0. _Hab._ South America, from Colombia to Argentina. 192. SYNALLAXIS SUPERCILIOSA, Cab. (EYEBROWED SPINE-TAIL.) +Synallaxis superciliosa+, _Cab. J. f. O._ 1883, p. 110 (Tucuman). _Description._--Above, head on top bright chestnut, lores white, superciliaries yellowish white; sides of head, neck, and back earthy brown inclining to olive; upper wing-coverts chestnut, wing-feathers blackish, the webs of the outer margins dull chestnut; tail chestnut; beneath, upper half of throat white, lower half black tipped with white; breast and belly brownish white; flanks and under tail-coverts pale earthy brown; under wing-coverts fulvous; bill and feet horn-colour: whole length 7·0 inches, wing 2·0, tail 3·5. _Hab._ Tucuman. This Spine-tail, so far as we know at present, is peculiar to Tucuman, where it was discovered by Herr Schulz. 193. SYNALLAXIS SPIXI, Scl. (SPIX'S SPINE-TAIL.) +Synallaxis spixi+, _Burm. P. Z. S._ 1868, p. 636 (Buenos Ayres); _Scl. et Salv. P. Z. S._ 1869, p. 632 (Buenos Ayres); _Scl. P. Z. S._ 1874, p. 9. _Description._--Above, crown chestnut; lores and sides of head dark cinereous; hind neck, back, also wing- and tail-feathers olive-brown; upper wing-coverts chestnut; beneath dark cinereous, becoming whitish on the belly, throat blackish; under wing-coverts fulvous chestnut; bill black, feet horn-colour; whole length 6·7 inches, wing 2·0, tail 3·2. _Hab._ Southern Brazil and Argentina. I like Azara's name _Chicli_, which, to one acquainted with the habits of this and of the following species, seems very appropriate, suggesting, as I imagine it does, a small creature possessing a sharp two-syllabled note; for although Hartlaub, in his Nomenclature of Azara, gives _S. ruficapilla_ as the species meant by _Chicli_, the account of its habits in the 'Apuntamientos' seems to point to _S. spixi_ or to _S. albescens_.