CAMARHYNCHUS _differt a genere_ GEOSPIZA, _rostro debiliore, margine mandibulæ superioris minùs indentato; culmine minùs elevato in frontem et plus arcuato; lateribus tumidioribus; mandibulâ inferiore minus in genas tendente._ _Camarhynchus psittaculus_ is the typical species. 1. CAMARHYNCHUS PSITTACULUS. _Gould._ PLATE XL. _C._ (Fœm.) _summo capite corporeque superiore fuscis; alis caudâque obscurioribus; gutture corporeque inferiore, cinerascenti-albis, stramineo tinctis; rostro pallidè flavescenti-fusco; pedibus fuscis._ Long. tot. 4¾ unc.; _alæ_, 2¾: _caudæ_, 1¾; _tarsi_, ⅞; _rostri_ ½; alt. _rostri_, ½. The upper part of the head and body fuscous; the wing and tail darker; the throat, and beneath the body cinereous white, tinged with straw colour; the bill pale yellowish fuscous, and the feet fuscous. Habitat, Galapagos Archipelago, (James’ Island.) The species of Camarhynchus do not differ in habits from those of Geospiza; and the _C. psittaculus_ might often be seen mingled in considerable numbers in the same flock with the latter. Mr. Bynoe procured a blackish specimen, which, doubtless, was an old male; I saw several somewhat dusky, especially about the head. 2. CAMARHYNCHUS CRASSIROSTRIS. _Gould._ PLATE XLI. _C._ (Mas jun. et Fœm.) _corpore superiore intensè brunneo, singulis plumis cinerascenti-olivaceo marginatis; gutture pectoreque cinerascenti-olivaceis, singulis in medio plumis obscurioribus; abdomine, lateribus crissoque cinereis stramineo tinctis._ Long. tot. 5½ unc.; _alæ_, 3¾; _caudæ_, 2; _tarsi_, 1⅛; _rostri_, ½; alt. _rostri_, ½. Upper part of the body deep brown, with each feather margined with cinereous olive; the throat and breast cinereous olive, with the middle of each feather darker; the abdomen, sides, and under tail coverts cinereous tinged with straw colour. Habitat, Galapagos Archipelago, (Charles Island?) I am nearly certain that this species is not found in James Island. I believe it came from Charles Island, and probably there replaces the _C. psittaculus_ of James Island. I obtained three specimens, one male, and two females; from the analogy of so many species in this group, I do not doubt the old male would be black. SUB-GENUS.—CACTORNIS. _Gould._ CACTORNIS _differt a genere_ GEOSPIZA _rostro elongato, acuto, compresso, longitudine altitudinem excellente; mandibulæ superioris margine vix indentato; naribus basalibus et vix tectis; tarsis brevioribus, unguibus majoribus et plus curvatis._ _Cactornis scandens_ is the typical species. 1. CACTORNIS SCANDENS. _Gould._ PLATE XLII. _C. intensè fuliginosa, crisso albo; rostro et pedibus nigrescenti-brunneis._