sf pri- ers of E con- J over from elo) », and CO — rmed idden males . 143. . 144, yperly pecies m the their pidity emely small ; . 145. found IN TROD U CLrLON Ixvii 165. ACESTRURA DECORATA, Gould. Calothorax decoratus, Gould : : . : , Vol. III. Pl. 146. Habitat. Uncertain, but supposed to be Antioquia, in New Granada 166. AcestRuRA He.roport. Calothorax Heliodori . : : : : Lucifer Heliodori, Reichenb. Troch. Enum. p. 10. Chaetocercus Heliodori, Cab. et Hein. Mus. Hein. Theil iii. p. 60. Calothorax bombilus, Reichenb. MS. Habitat. The Andes of New Granada. Volk Hie Elia 7. 167. ACESTRURA MICRURA, Gould. Calothorax micrurus, Gould . : : : 5 : ; : : : i : Vol. III. Pl. 148. Habitat. Peru or Bolivia. The members of the genus Acestrura naturally lead on to the Calothorax Rose and C. Jourdani, constituting the Genus Cuztocercus, G. R. Gray. Both these birds have very singularly formed tails,as may be seen on reference to the respective plates on which they are represented. 168. Cua#tocercus Ros. Calothorax Rosz ; : : : : : ; i : : 3 : : Vol. III. Pl. 149. Chaetocercus Rosae, Cab. et Hein. Mus. Hein. Theil iii. p. 60. Habitat. Venezuela. 169. CH#TocERcuUs JOURDANI. Calothorax Jourdani . : s : : : 3 5 d : : : : Vol. IIT. Pl. 150. Habitat. The Island of Trinidad, where Mr. Tucker states that it frequents the Savannahs, but is very rare. The bird which I have figured under the name of Calothorax Fanny is the type of the Genus Myrtis, Recchend., which I adopt for that beautiful bird and the C. Yarrelli, as I consider them to be a very distinct form, and one which is especially remarkable for the structure of the tail. 170. Myrtis Fannie. Calothorax Fanny : : ; ; ; : : : : : : ; : Vol. IIT. Pl. 151. Habitat. Ecuador and Peru. Mr. Fraser found it at Cuenca in November, 1857, when it was “ common about the gardens and lane hedge- rows. It makes much more humming with its wings than the long-tailed green Lesbia.”—Proc. Zool. Soc., part XXV1. p. 459. 171. Myrtis YARRELLI. Calothorax Yarrelli l ‘ i : : : : 5 : : : : ; Vol. III. Pl. 152. Habitat. Western Peru, particularly the neighbourhood of Arica. How very singular and diversified in form are the Humming-Birds of Peru! So varied indeed are they, that almost every species demands a generic appellation; the 7. Core with its beautiful throat and lengthened tail is the type of the Genus Toaumastura, Bonap. Of this peculiar form only one species is known, of which the male alone is decorated with fine colours, and bears the singularly constructed tail. 172. THauMAstTuRA Cor# . : i : ‘ : ‘ ; ; : i . 4 Vol TH. Pr. 153. Ornismya cora, Dev. Rev. et Mag. de Zool. 1852, p. 217. Habitat. Peru. M. Deville states that this bird is found during the months of February, March, April, and May only, in the