INTRODUCTION. Ixxvili Vol. ITI. Pl. 196. 221. METALLURA SMARAGDINICOLLIS smaragdinicollis, Cab. et Hein. Mus. Hen Theil ili. p. 68, note. Urolampra Habitat. Peru and Bolivia. e subjects hitherto referred to in the present volume, and beautiful as is the colouring of t genus is composed of birds which cannot boast of any br and have nothing to recommend them to our notice but chaste and aried as have been th : : Varied as illiancy of colouring ; on the many of the species, the nex contrary, they are clothed in very sombre attire, delicate hues; still in my opinion they are not the less interesting. Genus ApeLomyiA, Bonap. Vol. III. Pl. 197. 222. ADELOMYIA INORNATA : : : Adelisca inornata, Cab. et Hein. Mus. Hein. Theil ii. p. 72, note. Habitat. Bolivia. Vol. III. Pl. 198. 223. ADELOMYIA MELANOGENYS Adelisca melanogenys, Cab. et Hein. Mus. Hein. 1 Theil Les |e die Habitat. New Granada. Precisely the same kind of difference occurs between examples of this form from Venezuela and Ecuador that has been described as occurring with regard to the Metallura tyrianthina and M. Quitensis. The species of Adelomyia inhabiting Ecuador and Peru is very considerably larger than the A. melanogenys from Venezuela; it has more buff at the base of the tail-feathers, and a much more conspicuously spotted throat and breast; for this Ecuadorian bird I therefore propose the name of maculata :— 224 ADELOMYIA MACULATA, Gould . ; ; : : : ‘ : 3 : Y Vol. III. Pl. 199. Habitat. Ecuador. Avocettula and Avocettinus are the generic terms applied to the two species rendered remarkable by the points of the mandibles being curved upwards in the shape of a hook: this extraordinary deviation from the usual structure is doubtless designed for some especial purpose; but what that may be, is at present unknown to us. In placing these two species near to each other, I do not mean to convey an idea that they are very nearly allied. One is an inhabitant of the Andes, the other of Guiana and the neighbouring countries. Nothing what- ever is known respecting these singular birds. Genus Avocerrinus, Bonap. 225. AVOCETTINUS EURYPTERUS . : : : : : ; : : . Vol. III. Pl. 200. Opisthoprora euryptera, Cab. et Hein. Mus. Hein. Theil iii. p. 76, note. Habitat. The high lands of New Granada. Genus Avocerrua, Reichend. 226. AVOCETTULA RECURVIROSTRIS . : ‘ : : : Vol. III. Pl. 201 Trochilus avocetta, Jard. Nat. Lib. Humming Birds, vol. i. p. 78, sal OF recurvirostris, Jard. Nat. Lib. Humming Birds, vol. ii. p: 80. Hylocharis avocetta, Gray & Mitch. Gen. of Birds, vol. i. p. 114, Hylocharis, sp. 12. Streblorhamphus recurvirostris, Cab. et Hein. Mus. Hein. Theil iii. DriGz Habitat. The Guianas. Genus AnrHoceruara, Cab. This generic term has been proposed by Dr. Cabanis for the bird I have figured under the name of Adelomyia floriceps, which is at present the only species of the form known ; for, although I have ventured to place with it my Adelomyia ? castaneiventris, I am unable to say, from the imperfect materials at my command, whether it really belongs to the present or to some other genus. 227. ANTHOCEPHALA FLORICEPS Adelomyia floriceps, Gould Vol. III. Pl ; . ITT. Pi. 202: Anthocephala floriceps, Cab. et Hein. he Hein, Theil lll. p. 72, note. Habitat. Columbia. if