_Description._--Above pale earthy brown, superciliaries whitish; wing-feathers blackish, the basal part of the secondaries pale chestnut, forming a transverse band; four middle tail-feathers blackish, the lateral pale chestnut; beneath whitish brown; middle of throat pale rufous; under wing-coverts fulvous; bill and feet horn-colour: whole length 6·5 inches, wing 2·2, tail 3·2. _Hab._ Bolivia and Argentina. This Spine-tail has been noticed by various observers in Northern Argentina, and, if we are correct in referring _S. flavigularis_ of Döring to the same species, occurs also in the Rio Negro district. 199. SYNALLAXIS MODESTA, Eyton. (MODEST SPINE-TAIL.) +Synallaxis modesta+, _Scl. et Salv. Nomencl._ p. 64; _Scl. P. Z. S._ 1872, p. 544 (Rio Negro), et 1874, p. 23. +Synallaxis flavogularis+, _Burm. La-Plata Reise_, ii. p. 468 (Mendoza). _Description._--Above earthy brown, superciliaries whitish; wings blackish, the basal half of secondaries pale clear brown, forming a transverse bar; tail black, the outer webs of all the rectrices pale chestnut; beneath whitish brown, with a large fulvous spot on the throat; under wing-coverts fulvous; bill and feet pale brown: whole length 6·0 inches, wing 2·4, tail 2·5. _Female_ similar. _Hab._ Argentina, Patagonia, Chili. This species so closely resembles the following in size and dull earthy-brown colour, that where seen in the thickets it is impossible to distinguish them. In habits they also seem alike; but this bird is, I think, less retiring, for I have seen it associating with other species of _Synallaxis_. On comparing specimens together, however, it is easy to separate the present bird from _S. sordida_ by noticing the colour of the external rectrices, which are black, externally edged with rufous, instead of being wholly rufous. 200. SYNALLAXIS SORDIDA, Less. (SORDID SPINE-TAIL.) +Synallaxis sordida+, _Hudson, P. Z. S._ 1872, p. 543 (Rio Negro); _Scl. et Salv. Nomencl._ p. 64; _Scl. P. Z. S._ 1874, p. 23; _Durnford, Ibis_, 1878, p. 396 (Centr. Patagonia); _White, P. Z. S._ 1883, p. 39 (Cordova); _Barrows, Bull. Nutt. Orn. Cl._ viii. p. 208 (Entrerios). _Description._--Above earthy brown; wing-feathers blackish brown, their basal parts pale chestnut-brown, forming a transverse bar; tail blackish, the three outer rectrices and outer web of the fourth rectrix on each side wholly pale chestnut-brown; beneath pale earthy brown, clearer on the belly, and with a bright fulvous spot on the throat; under wing-coverts pale cinnamomeous; bill and feet blackish: whole length 6·5 inches, wing 2·3, tail 2·8. _Female_ similar. _Hab._ Patagonia and East Argentina.