_S. pallide rubro fusca; primariis secundariisque rufis apice fuscis; caudæ plumis quatuor mediis nigrescenti fuscis, duabus proximis ferrugineo fuscis internè nigrescenti-marginatis, duabus extimis ferrugineo fuscis; genis, gulâ abdomineque medio albescentibus; hypochondriis cinereis._ Long. tot. 5⁴⁄₁₂; unc.; _rost._ ⁵⁄₁₂; _alæ_, 2³⁄₁₂; _caudæ_, ⅝; _tarsi_, ¹⁰⁄₁₂. Head and all the upper surface pale reddish brown; primaries and secondaries, brown at the tip and rufous at the base; four central tail feathers, blackish brown; the next on each side rusty brown, margined internally with blackish brown; the two lateral feathers wholly rusty brown; sides of the face, throat, and centre of the abdomen, whitish; flanks cinereous; bill and feet brown. Habitat, Port Desire, Patagonia. (_January._) [Illustration: _Birds. Pl. 24._ _Synallaxis flavogularis._ ] This little bird frequents the thickets in the dry valleys near Port Desire. It often flies from bush to bush, and its habits are nearly like those of the rest of the genus. From its tail feathers, however, being little used, and the tarsi being slightly elongated, I suppose it lives chiefly on the ground. I may observe, that this species comes nearest to _S. flavogularis_, but that in the form of its tail, straightness of bill, and kind of plumage, it departs from Synallaxis, and approaches Eremobius. 7. SYNALLAXIS ÆGITHALOIDES. _Kittl._ S. Ægithaloides. _Kittl._ Mem. de l’Acad. 11. pl. vii.—_Vog. von Chili_, p. 15, pl. vii. This bird is common throughout Patagonia and Central Chile, being found wherever thickets grow on a rocky or dry soil. It sometimes moves about in small flocks. Its habits, as Kittlitz remarks, resemble in many respects, those of a titmouse (_Parus_); but there is one remarkable point of difference, namely, that this bird is able to _run_ very quickly on the ground. It does not always do so, but often hops about with great activity; nevertheless, I repeat, I have distinctly seen it running very quickly amongst the thickets. When hopping from twig to twig, it does not use its long tail, any more than the long-tailed titmouse (_Parus caudatus_) of Europe. It utters a harsh, shrill, quickly reiterated cry, like so many other species of this genus and the allied ones. In Chile, I several times saw a very large cylindrical nest, built of prickly twigs of the mimosa, and placed in the middle of a thorn-bearing bush, with its mouth at the upper extremity; I was assured by the country people, that although so very large, it belonged to this little bird.[11] This kind of nidification, the habit of feeding on the ground, and the length of acuminated tail, are points of resemblance with _S. major._ 8. SYNALLAXIS RUFICAPILLA. _Vieill._