GENUS.—SERPOPHAGA. _Gould._ _Rostrum capite multò brevius, rectum, subdepressum; tomiis rectis; mandibulâ superiore subemarginatâ; naribus basalibus, lateralibus, pilis mollibus anticè versis partim tectis. Alæ breves, concavæ, remige quartâ longissimâ. Cauda longiuscula subrotundata. Tarsi mediocres squamis duris annulati; digitis parvis, postico mediano breviore, lateralibus æqualibus, exteriore cum mediano usque ad articulum priorem connatum._ 1. SERPOPHAGA PARULUS. _Gould._ Muscicapa parulus, _Kitlitz_, Mem. L’Acad. Imp. des Sci. St. Peters. 1831. 1. p. 190. Pl. 9. Sylvia Bloxami, _Gray’s_ Zool. Misc. 1831. p. 11. Culicivora parulus, _D’Orb. & Lafr._ Mag. de Zool. 1837, p. 57. This bird is common in central Chile, in Patagonia, and although found in Tierra del Fuego, it is not numerous there. Its specific name is very well chosen, as I saw no bird in South America whose habits approach so near to those of our tom-tits (_Parus_). It frequents bushes in dry places, actively hopping about them, and sometimes repeating a shrill cry; it often moves in small bodies of three and four together. In August I found the nest of one in a valley in the Cordillera of central Chile; it was placed in a bush and was simply constructed. 2. SERPOPHAGA ALBO-CORONATA. _Gould._ _S. supra olivaceo-brunnea, subtus pallidè flava; pileo nigrescenti brunneo, in hoc plumarum basibus lineâque supra oculos albis; alis nigrescenti brunneis, primariis angustè olivaceo marginatis, tectricibus latè olivaceo-griseo marginatis, gutture griseo._ Long. tot. 4³⁄₁₂; _alæ_, 2; _caudæ_, 2; _tarsi_, ⁸⁄₁₂; _rost._ ⁶⁄₁₂. A stripe of white from the nostrils over each eye; crown of the head brown, the base of all the feathers pure white; back of the neck, back and upper tail coverts olive brown; wings blackish brown, the external edges of the primaries finely margined with olive, and the greater and lesser wing coverts largely tipped with olive grey; tail uniform brown; throat grey; abdomen and under tail coverts pale citron yellow; bill and feet brown. Habitat, Maldonado, La Plata, (_June_). This bird, like the last species, generally moves in very small flocks. Its habits, I presume, are also very similar; for I state in my notes that it closely approaches to our tit-mice in general manners and appearance. 3. SERPOPHAGA NIGRICANS. _Gould._ Sylvia nigricans, _Vieill._ Tachuris nigricans, _D’Orb. & Lafr._ Mag. de Zool. 1837. p. 55. Le Petit Tachuris noirâtre, _Azara_, No. 167.