This bird is extremely common on the sea shore of all the bays and channels of Tierra del Fuego; on the western coast it is replaced in Northern Chile by the _O. nigrofumosus_, and in the Falkland Islands by the _O. antarcticus_. As the habits of this species and those just named are quite similar, I shall describe them all together under the head of _O. nigrofumosus_. A specimen of _O. Patagonicus_ from Chiloe has a bill rather more than two-tenths of an inch longer than in those from Tierra del Fuego; but as no other difference can be perceived, I cannot allow that this is a specific character any more than in the case of the _Uppucerthia_. 3. OPETIORHYNCHUS ANTARCTICUS. _G. R. Gray._ Certhia antarctica, _Garn._ Ann. des Sc. Nat. 1826. Furnarius fuliginosus, _Less._ Voy. de la Coqu. Zool. i. p. 670. Patagonian Warbler, _Lath._ ♀ in Dixons Voy. App. No. 1, 359 and pl. This species inhabits the Falkland Islands. My specimens were procured at the east island, from which, also, those described by the French naturalists came, and likewise that given in the Appendix to Dixon’s Voyage. I have no doubt that it is peculiar to this group, for the foregoing species, which in the neighbouring mainland of Tierra del Fuego supplies its place and has precisely the same habits, has been examined by Mr. Gould and is considered distinct. The _O. antarcticus_ has long been noticed by voyagers to the Falkland Islands from its extreme tameness: in the year 1763 Pernety states it was so tame that it would almost perch on his finger, and that in half an hour he killed ten with a wand. 4. OPETIORHYNCHUS NIGROFUMOSUS. _G. R. Gray._ PLATE XX. Uppucerthia nigro-fumosa, _D’Orb. & Lafr._ Mag. de Zool. 1838, p. 23. Opetiorhynchus lanceolatus, _Gould_, MS. and on plate XX. My specimen was killed at Coquimbo, on the coast of Chile. It differs from _O. Patagonicus_ in its larger size, much stronger feet and bill, and more dusky plumage, and in the white streak over the eye being less plainly marked. In this species the red band, which extends from the body obliquely across the wings in all the species, reaches to the third primary, whereas in _O. Patagonicus_, _O. vulgaris_, and _O. antarcticus_, that feather is not marked, or so faintly, as scarcely to be distinguishable. In the genus Furnarius, the wing feathers are marked in an analogous manner. I saw this species (as I believe) on the coast near the mouth of the valley of Copiapó.