Long. tot. 4¾ unc.; _alæ_, 3; _caudæ_, 1½; _tarsi_, ¹⁰⁄₁₂; _rostri_, ⁷⁄₁₂. Deep sooty black; with the under tail-coverts and the bill reddish brown tinged with black; the feet black. Female (or young male): The body above, breast and throat, deep fuscous, with each feather margined with cinereous olive: the abdomen, and under tail-coverts pale cinereous brown; the bill reddish fuscous, with the apex yellowish, and the feet like those in the male. Habitat, Galapagos Archipelago, (Charles and Chatham Islands.) 4. GEOSPIZA NEBULOSA. _Gould._ _G. summo capite et corpore nigrescenti-fuscis; singulis plumis cinerascenti-olivaceo marginatis; corpore subtus pallidiore, abdomine imo crissoque cinerascentibus; rostro et pedibus intensè fuscis._ Long. tot. 5 unc.; _alæ_, 2¾; _caudæ_, 1¾; _tarsi_, ¾; _rostri_, ⅝; alt. _rost._ ½. MALE.—Upper part of the head and body blackish fuscous, with each feather margined with cinereous olive; the body beneath paler, with the lowest part of the abdomen and under tail-coverts ashy; the bill and feet deep fuscous. Habitat, Galapagos Archipelago, (Charles Island.) 5. GEOSPIZA FULIGINOSA. _Gould._ _G. intensè fuliginosa, crisso albo, rostro fusco; pedibus nigrescenti-fuscis._ Long. tot. 4½ unc.; _alæ_, 2½; _caudæ_, 1⅝; _tarsi_, ¾; _rostri_, 1½; alt. _rostri_, ⅜. Fœm. _Summo corpore, alis, caudâque intensè fuscis; singulis plumis cinerascenti-ferrugineo marginatis; corpore infra cinereo, singulis plumis medium versus obscurioribus; rostro brunneo; pedibus nigrescenti-brunneis._ Deep sooty black, with the under tail coverts white; the bill fuscous, and the feet blackish fuscous. Female: Upper part of the body; the wings and tail deep fuscous, with each feather margined with ashy ferrugineous; beneath the body cinereous, with each feather towards the middle darker; the bill brown, and the feet blackish brown. Habitat, Galapagos Archipelago. (Chatham and James’ Island.) 6. GEOSPIZA DENTIROSTRIS. _Gould._ _G._ (Fœm. vel Mas jun.) _mandibulæ superioris margine in dentem producto, vertice corporeque supra fuscis; singulis plumis medium versus obscurioribus; secundariis tectricibusque alarum ad marginem stramineis; gutture et pectore pallidè brunneis, singulis plumis medium versus obscurioribus, imo abdomine crissoque cinerascenti-albis; rostro rufo-fusco; pedibus obscurè plumbeis._ Long. tot. 4¾ unc.; _alæ_, 2⅜; _caudæ_, 1¾; _rostri_, ½; alt. _rost._ ⅜.