Tyranninæ, 42 Tyrannula magnirostris, 48 —— _auriceps_, 47 —— _parvirostris_, 48 _Tyrannus Irupero_, 53 —— _pepoaza_, 54 —— _polyglottus_, 54 —— _nengeta_, 54 —— _magnanimus_, 43 —— _sulphuratus_, 43 —— _gutturalis_, 56 —— _coronatus_, 54 —— _Savana_, 43 Ulula rufipes, 34 Ululinæ, 32 Uppucerthia dumetoria, 66 —— dumetoria, Anat. Descript. of, 148 —— _dumetorum_, 66 _Uppucerthia vulgaris_, 66 —— _rupestris_, 67 _Uppucerthia nigro-fumosa_, 68 _Vanellus cinctus_, 126 Viralva aranea, 145 _Vultur gryphus_, 3 —— _aura_, 8 —— _atratus_, 7 —— _jota_, 7 Vulturidæ, 3 _White-rumped snipe_, 130 Xanthornus chrysopterus, 106 —— flavus, 107 Xema cirrocephalum, 142 Xolmis nengeta, 54 —— coronata, 54 —— variegata, 55 —— Pyrope, 55 _Yahana proprement dit_, 133 _Ypecaha_, 133 _Yellow crested grosbeak_, 88 _Yellow shanks snipe_, 129 _Yetapa psalura_, 51 Zaporina notata, 132 —— spilonota, 132 Zenaida aurita, 115 —— Galapagoensis, 115 —— Boliviana, 116 Zonotrichia strigiceps, 92 —— canicapilla, 91 —— matutina, 91 ----- Footnote 1: I measured a specimen, which I killed there: it was from tip to tip of wing, eight and a half feet; and from end of beak to end of tail four feet. Footnote 2: I noticed that several hours before any of the Condors died, all the lice with which they are infested, crawled to the outside feathers. I was told, that this always happened. Footnote 3: In the case of the _Cathartes Aura_, Mr. Owen, in some notes read before the Zoological Society, (See Magazine of Nat. Hist. New Ser. vol. i. p. 638.) has demonstrated from the developed form of the olfactory nerves, that this bird must possess an acute sense of smell. It was mentioned on the same evening, in a communication from Mr. Sells, that on two occasions, persons in the West Indies having died, and their bodies not being buried till they smelt offensively, these birds congregated in numbers on the roof of the house. This instance appears quite conclusive, as it was certain, from the construction of the buildings, that they must have gained the intelligence by the sense of smell alone, and not by that of sight. It would appear from the various facts recorded, that carrion-feeding hawks possess both senses, in a very high degree. Footnote 4: Voyage dans l’Amérique Méridionale, vol. iii. p. 24. Footnote 5: In this work, whenever the particular name of any colour is given, or it is placed within commas, it implies, that it is taken from comparison with Patrick Syme’s edition of Werner’s Nomenclature of Colours. Footnote 6: _Mileago Chimango_ of this work. Footnote 7: Novorum Actorum Academiæ Cæsariæ, Leopol. vol. xvi. p. 62. Observationes Zoologicas, F. J. Meyenii. Footnote 8: Tom. iii. p. 162. Footnote 9: Voyage dans l’Amérique Meridionale Partie, Oiseaux, p. 52. Footnote 10: