_Wood-Ibis_, ii. 108. _Woodpecker, Allied_, ii. 20. ----, _Boie's_, ii. 17. ----, _Cactus_, ii. 19. ----, _Gold-backed_, ii. 21. ----, _Pampas_, ii. 24. ----, _Red-crested_, ii. 21. ----, _Red-faced_, ii. 18. ----, _Red-fronted_, ii. 20. ----, _Schulz's_, ii. 18. ----, _Tucuman_, ii. 21. ----, _Varied_, ii. 19. ----, _White-bellied_, ii. 23. _Wood-singer, Brown-capped_, i. 21. ----, _Golden-crowned_, i. 21. ----, _Pitiayumi_, i. 20. ----, _Veiled_, i. 20. _Wren, Black-headed Reed-_, i. 13. ----, _Brown House-_, i. 13. ----, _Eared_, i. 15. ----, _Platan Marsh-_, i. 15. _Wren-like Spine-tail_, i. 188. Xanthornus pyrrhopterus, i. 107. Xanthosomus flavus, i. 98. ---- ruficapillus, i. 99. Xiphocolaptes albicollis, i. 200. ---- major, i. 201. Xolmis variegata, i. 116. _Yabirú_, ii. 106. _Yacú caraguata_, ii. 147. _Yacúhú, El_, ii. 146. _Yellow Cardinal_, i. 55. ---- _House-Sparrow_, i. 66. ---- _Seed-Finch_, i. 69. _Yellow-bellied Tyrant_, i. 137. _Yellow-billed Coot_, ii. 158. ---- _Cuckoo_, ii. 37. ---- _Saltator_, i. 42. ---- _Teal_, ii. 131. ---- _Tit-Tyrant_, i. 142. _Yellow-breasted Marsh-bird_, i. 102. _Yellow-browed Tyrant_, i. 125. _Yellow-headed Marsh-bird_, i. 98. _Yellow-marked Spine-tail_, i. 185. _Yellow-shouldered Marsh-bird_, i. 97. ---- _Song-Sparrow_, i. 60. _Yellow-striped Tanager_, i. 41. _Yellowshank, Greater_, ii. 106. ----, _Lesser_, ii. 187. _Yetapa Tyrant_, i. 124. _Ynambū azulado_, ii. 207. ---- _tatāupā_, ii. 208. _Ypecaha Rail_, ii. 150. _Zancudo_, ii. 179. Zapornia notata, ii. 155. Zenaida maculata, ii. 141. Zonotrichia canicapilla, i. 55, 59. ---- hypochondria, i. 60. ---- matutina, i. 58. ---- pileata, i. 58, 59. ---- strigiceps, i. 60, 64. _Zorsal_, i. 4. TRANSCRIBER'S NOTE: The following amendments were made to the text: