(Trochilidae; Ϯ Tooth-billed Hummingbird A. aequatorialis) Gr. ανηρ anēr, ανδρος andros man; οδους odous, οδων odōn tooth; “I send for insertion in your next Number a description of a new and very singular Humming-Bird which I have lately received from Ecuador. Not only does it differ specifically from every other with which I am acquainted, but it also differs in its structure from every form comprised in the great family of Trochilidæ. I therefore propose to call it Androdon æquatorialis. This new bird is so very singular that it is not easy to say which section of the family it is most nearly related; but in some of its characters it assimilates with Gryphus, Eutoxeres, and Doryfera. In size it is about equal to Lampornis Mango; the edges of its mandibles are thickly set with fine teeth, like those of Gryphus, but are more strongly developed; the bill is very long for the size of the bird, and has rather an upward curvature; the wings are moderate in proportion to the body, and the tail is square or slightly rounded. The bird must be ranked among the dull-coloured species of its extensive family; at the same time it exhibits some approach to a metallic lustre in the blue or bronzy-red colouring of the hinder part of the crown. ... the one with a blue crown having the toothing very strongly developed, and the bill terminating in spiny hooks which cross each other when that organ is closed.” (Gould 1863); "Androdon Gould, Ann. and Mag. Nat. Hist. (3), 12, 1863, p. 247. Type, by monotypy, Androdon aequatorialis Gould." (Peters 1945, V, 4).