---- _Goose_, ii. 122. _Angela Humming-bird_, ii. 5. _Angelito de las Animas_, i. 118. _Ani, Black_, ii. 31. _Antarctic Rail_, ii. 148. Antenor unicinctus, ii. 63. Anthus correndera, i. 17, 19, 54, 80. ---- furcatus, i. 19. ---- pratensis, i. 17. ---- rufus, i. 17. Antrostomus longirostris, ii. 14. ---- parvulus, ii. 14. _Anumbé roxo_, i. 195. _Añumbi_, i. 189, 190, 191. Anumbius acuticaudatus, i. 31, 67, 88, 96, 133, 187, 189. ---- striaticollis, i. 194. Aphobus chopi, i. 108. Aptenodytes demersa, ii. 206. Aramides gigas, ii. 150. ---- nigricans, ii. 150. ---- rhytirhynchus, ii. 149. ---- ypecaha, ii. 150. Aramus scolopaceus, ii. 159. Ardea cærulea, ii. 99. ---- candidissima, ii. 98, 99. ---- cocoi, ii. 93, 94. ---- egretta, ii. 98, 99, 105. ---- gardeni, ii. 105. ---- leuce, ii. 98. ---- marmorata, ii. 104. ---- nivea, ii. 99. ---- sibilatrix, ii. 100. Ardetta involucris, ii. 93, 101, 227. _Argentine Blackbird_, i. 4. ---- _Cow-bird_, i. 72. ---- _Flamingo_, ii. 117. Arremon orbignii, i. 41. Arundinicola flaviventris, i. 137. ---- leucocephala, i. 122. _Ashy Tyrant_, i. 121. _Ashy-black Tyrant_, i. 126. _Ashy-headed Goose_, ii. 124. Asio accipitrinus, ii. 49. ---- brachyotus, ii. 49. Asturina pucherani, ii. 58. ---- rutilans, ii. 63. ---- unicincta, ii. 63. Athene cunicularia, ii. 52. Atticora cyanoleuca, i. 33, 166. ---- fucata, i. 35. Aulanax latirostris, i. 121. _Avestruz petizo_, ii. 219. _Aymara Dove_, ii. 142. ---- _Parrakeet_, ii. 46. _Azara's Sand-Plover_, ii. 173. ---- _Tanager_, i. 40. ---- _Trogon_, ii. 29. _Azure Jay_, i. 110. _Bahama Duck_, ii. 135. ---- _Pintail_, ii. 135. _Bailarin_, ii. 71. _Baird's Sandpiper_, ii. 184, 185. _Banduria_, ii. 112. _Bank Parrot_, ii. 41. ---- _Swallow_, i. 33. _Barn-Owl, Common_, ii. 48. _Barred Upland Goose_, ii. 123. Bartramia longicauda, ii. 189. _Bartram's Sandpiper_, ii. 189. Basileuterus auricapillus, i. 21. ---- vermivorus, i. 21. _Batitú_, ii. 189. _Bay-winged Cow-bird_, i. 95. _Bécard, White-winged_, i. 162. Bernicla antarctica, ii. 123. ---- dispar, ii. 123. ---- magellanica, ii. 123. ---- melanoptera, ii. 122. ---- poliocephala, ii. 124. _Bienteveo Tyrant_, i. 147. _Bittern, Marbled Tiger-_, ii. 104. _Black Ani_, ii. 31. ---- _Duck_, ii. 137. ---- _Rail_, ii. 149. ---- _Vulture_, ii. 89. _Black-and-chestnut Warbling Finch_, i. 49. _Black-and-yellow Thickbill_, i. 43. _Black-and-yellow-crested Tyrant_, i. 157. _Black-billed Cuckoo_, ii. 38. _Blackbird, Argentine_, i. 4. _Black-crowned Tyrant_, i. 115. _Black-faced Ibis_, ii. 110. _Black-headed Duck_, ii. 130. ---- _Finch_, i. 45. ---- _Reed-Wren_, i. 13. ---- _Siskin_, i. 64. ---- _Thrush_, i. 4. ---- _Tyrant_, i. 157.