_Rostrum capitis longitudine, aut longius, culmine recto, gonide ascendente, per omnes partes lateraliter compressum, durum et apice inemarginatum, naribus basalibus longitudinalibusque; alæ mediocres et subacuminatæ, plumis tertia, quarta et quinta æqualibus longissimisque; cauda mediocris, scapis ultra radios in spinas acutas productis; tarsi sub-breves, digitis unguibusque longis, his multum curvatis, digito externo valido et ferè digiti medii longitudine, digitis lateralibus inæqualibus, internis multum brevioribus._ DENDRODRAMUS LEUCOSTERNUS. _Gould._ PLATE XXVII. _D. capite, dorsi parte superiore alisque nigrescenti fuscis, rubro-tinctis; primariis secundariisque subferrugineo fusco irregulariter marginatis, uropygio caudâque nitidè ferrugineis, gulâ pectoreque albis, abdomine medio rufescenti-fusco, singulis plumis ad apicem maculâ magnâ ovali albâ; hypochondriis saturatè rufis; rostro basi corneo, apice pedibusque nigro fuscis._ Long. tot. 6³⁄₁₂ unc.; _rostri_, 1¹⁄₁₂; _alæ_ 3; _caudæ_, 2⁹⁄₁₂; _tarsi_, ⁹⁄₁₂. Head, upper part of the back and wings blackish brown, tinged with red; primaries and secondaries irregularly margined with dull rusty brown; rump and tail rich ferruginous; throat and chest white; feathers of the centre of the abdomen reddish brown, with a large oval spot of white near the tip of each feather; flanks deep rufous; bill horny at the base, the remainder and the feet blackish brown. Habitat, Chiloe and Southern Chile. [Illustration: _Birds. Pl. 27._ _Dendrodramus leucosternus._ ] This bird is common in the forests of Chiloe, where, differently from the _Oxyurus tupinieri_, it may constantly be seen running up the trunks of the lofty forest trees. Its manners appeared to me to resemble those of _Certhia familiaris_. I found Coleopterous insects in its stomach. Its range does not appear to be extensive; Chiloe to the south, and some woods near Rancagua (a degree south of Valparaiso) were the extreme points where I met with it. The Dendrodramus is not found in Tierra del Fuego, where the _O. tupinieri_ is so numerous. Mr. G. R. Gray remarks that this genus is very nearly allied to Dendroplex of Mr. Swainson. FAMILY.—SYLVIADÆ. SUB-FAM.—MOTACILLINÆ. 1. MUSCISAXICOLA MENTALIS. _D’Orb. & Lafr._ M. mentalis, _D’Orb. & Lafr._ Mag. de Zool. 1837, p. 66. —— Voy. dans l’Amer. Mer. Ornith. pl. 40, f. 1.