_Black-necked Tanager_, i. 37. _Black-tailed Skimmer_, ii. 193. _Black-winged Dove_, ii. 142. _Blackish Finch_, i. 54. ---- _Tyrant_, i. 141. _Blue Heron_, ii. 99. ---- ----, _Little_, ii. 101. ---- _Tanager_, i. 39. _Blue-and-yellow Tanager_, i. 39. _Blue-billed Tyrant_, i. 127. _Blue-fronted Amazon_, ii. 47. _Blue-winged Teal_, ii. 130. _Boat-tail, Chopi_, i. 108. _Boie's Woodpecker_, ii. 17. Bolborhynchus aymara, ii. 46. ---- monachus, ii. 43. Bolborhynchus rubrirostris, ii. 46. _Bonaparte's Sandpiper_, ii. 185. _Boyero_, i. 101, 116. _Brazilian Cormorant_, ii. 91. ---- _Lochmias_, i. 174. ---- _Stilt_, ii. 179. ---- _Teal_, ii. 133. _Bridges's Wood-hewer_, i. 199. _Bright-cheeked Grebe_, ii. 204. _Broad-billed Tyrant_, i. 136. _Brown Buzzard_, ii. 63. ---- _Cinclodes_, i. 172. ---- _Cuckoo_, ii. 35. ---- _Gallito_, i. 207. ---- _House-Wren_, i. 13. ---- _Martin_, i. 35. ---- _Pintail_, ii. 134. ---- _Tinamou_, ii. 207. _Brown-capped Wood-singer_, i. 21. _Brown-crested Spine-tail_, i. 177. _Brown-fronted Spine-tail_, i. 178. _Brown-headed Wood-bird_, i. 23. _Brush-loving Fly-snapper_, i. 12. Buarremon citrinellus, i. 41. ---- (Atlapetes) citrinellus, ii. 223. Bubo crassirostris, ii. 50. ---- magellanicus, ii. 50, 51. ---- virginianus, ii. 50. Bucco chacuru, ii. 30. ---- maculatus, ii. 30. ---- striatipectus, ii. 30. _Buff-breasted Sandpiper_, ii. 190. _Burmeister's Cariama_, ii. 162. ---- _Humming-bird_, ii. 2. _Burrito_, ii. 150. _Burrowing Owl_, ii. 52. ---- _Parrot_, ii. 41. _Bush-bird, Larger_, i. 203. ----, _Leach's_, i. 202. ----, _Red-capped_, i. 204. ----, _Slaty-blue_, i. 204. Buteo albicaudatus, ii. 59, 61, 62. ---- erythronotus, ii. 62. ---- fuliginosus, ii. 60. ---- macropterus, ii. 58. ---- melanoleucus, ii. 64. ---- obsoletus, ii. 59. ---- oxypterus, ii. 59. ---- pterocles, ii. 61. ---- swainsoni, ii. 59, 60. ---- tricolor, ii. 62. ---- unicolor, ii. 60. Butorides cyanurus, ii. 101. ---- striata, ii. 101. _Buzzard, Brown_, ii. 63. ----, _One-banded_, ii. 63. ----, _Red-backed_, ii. 62. ----, _Swainson's_, ii. 59. ----, _White-tailed_, ii. 61. _Cabanis's Tyrant_, i. 128. _Cabeza amarilla_, i. 98. _Caburé_, ii. 52. _Cachalote_, i. 195. ----, _White-throated_, i. 197. _Cuchila_, i. 18. ---- _Pipit_, i. 17. _Cactus Woodpecker_, ii. 19. Cairina moschata, ii. 129. _Calandria_, i. 5. ---- _blanca_, i. 9. ---- _de las tres colas_, i. 9. ---- _Mocking-bird_, i. 5. Calidris arenaria, ii. 186. Calliperidia angelæ, ii. 5. ---- furcifera, ii. 1, 5, 8. Calodromas elegans, ii. 209, 214. _Caminante_, i. 166. Campephilus boiæi, ii. 17, 18. ---- pileatus, ii. 18. ---- schulzi, ii. 18. _Campestre_, ii. 24. Campias frontalis, ii. 20.