_Drepanis_ Temminck, Man. d'Orn. Ed. II, I p. LXXXVI (1820--"Espèces: _Certhia pacifica--obscura--vestiaria_ et probablement _falcata_, que je n'ai pas vu.") Type by elimination: _Drepanis pacifica_. The name _Drepanis_ is now restricted to the practically extinct "Mamo" of the natives of the Sandwich Islands. _Drepanis pacifica_ has a very striking black and yellow colouration; the somewhat loose-webbed under tail-coverts cover about three-quarters of the tail. The bill is long, curved, non-serrated, the upper mandible a few millimetres longer than the lower jaw. Nostrils large, covered by an operculum. First primary rudimentary, hidden by its covert. There is a silky, soft and fluffy axillary patch of feathers. The tail is slightly rounded. The metatarsus is covered with large, partly fused scutes. Only one species known. DREPANIS PACIFICA (GM.) _Great Hook-billed Creeper_ Latham, Gen. Synops. I p. 703 (1782). _Certhia pacifica_ Gmelin, Syst. Nat. I p. 470 (1788--ex Latham). Both Mr. Scott Wilson and myself have at length discussed this beautiful bird in our books on the Hawaiian Avifauna. Of the actual status of this bird in former times we know nothing. Latham described it first (Gmelin named this species after Latham's description) from a pair in the Leverian collection, which is now preserved in the Vienna Museum. About half a century ago several specimens were collected by the late W. Mills near Hilo, on the island of Hawaii, the only island where it existed. Nothing certain was heard of the "Mamo" until, in 1892, my collector Henry Palmer obtained a fine male, which was caught before his eyes by a native birdcatcher. In July, 1898, Mr. H. W. Henshaw saw "at least a pair, possibly a whole family," in the woods of Kaumana, and in 1899 a native heard the, to him, well-known call near the same place. This brings the existence of the Mamo down to the year 1898 or 1899. In view of the futile efforts of Messrs. Henry Palmer, {32} Perkins, Henshaw and others to observe this rare bird again, we may well suppose that this species is either extinct, or will very soon vanish if any are left. In former times the Mamo was probably more or less common. Its golden yellow feathers were of great value, and, though the majority of the famous war-cloaks are composed of the feathers of _Moho nobilis_, a few such cloaks are known to consist of Mamo feathers. It is supposed that it took generations to complete such a cape. I only know of specimens of this bird in Vienna, Leyden, Paris, Honolulu, Cambridge and Tring. The two examples in the Vienna Museum were obtained by Fichtel at the sale of the Leverian collection. One is perfect, the other has the upper portion of the bill wanting. {33} HEMIGNATHUS OBSCURUS ELLISIANUS GRAY. (PLATE 4, FIG. 1.)