Fam. XXXV. ARDEIDÆ, or HERONS. 315. _Ardea cocoi_, Linn. (Cocoi Heron.) 93 316. _Ardea egretta_, Gm. (White Egret.) 98 317. _Ardea candidissima_, Gm. (Snowy Egret.) 99 318. _Ardea cærulea_, Linn. (Blue Heron.) 99 319. _Ardea sibilatrix_, Temm. (Whistling Heron.) 100 320. _Butorides cyanurus_ (Vieill.). (Little Blue Heron.) 101 321. _Ardetta involucris_ (Vieill.). (Variegated Heron.) [Plate XVII.] 101 322. _Tigrisoma marmoratum_ (Vieill.). (Marbled Tiger-Bittern.) 104 323. _Nycticorax obscurus_, Bp. (Dark Night-Heron.) 105 Fam. XXXVI. CICONIIDÆ, or STORKS. 324. _Mycteria americana_, Linn. (Jabiru.) 106 325. _Euxenura maguari_ (Gm.). (Maguari Stork.) 106 326. _Tantalus loculator_, Linn. (Wood-Ibis.) 108 Fam. XXXVII. PLATALEIDÆ, or IBISES. 327. _Plegadis guarauna_ (Linn.). (White-faced Ibis.) 109 328. _Theristicus caudatus_ (Bodd.). (Black-faced Ibis.) 110 329. _Harpiprion cærulescens_ (Vieill.). (Plumbeous Ibis.) 112 330. _Phimosus infuscatus_ (Licht.). (Whispering Ibis.) 113 331. _Ajaja rosea_, Reichenb. (Roseate Spoonbill.) 114 Fam. XXXVIII. PHŒNICOPTERIDÆ, or FLAMINGOES. 332. _Phœnicopterus ignipalliatus_, Geoffr. et d'Orb. (Argentine Flamingo.) 117 333. _Phœnicopterus andinus_, Philippi. (Andean Flamingo.) 119 Order X. ANSERES. Fam. XXXIX. PALAMEDEIDÆ, or SCREAMERS. 334. _Chauna chavaria_ (Linn.). (Crested Screamer.) 119 Fam. XL. ANATIDÆ, or DUCKS. 335. _Bernicla melanoptera_ (Eyton). (Andean Goose.) 122 336. _Bernicla dispar_, Ph. et Landb. (Barred Upland Goose.) 123 337. _Bernicla poliocephala_, Gray. (Ashy-headed Goose.) 124 338. _Cygnus nigricollis_, Gm. (Black-necked Swan.) [Plate XVIII.] 124 339. _Coscoroba candida_ (Vieill.). (Coscoroba Swan.) 126 340. _Dendrocygna fulva_ (Gm.). (Fulvous Tree-Duck.) 126 341. _Dendrocygna viduata_ (Linn.). (White-faced Tree-Duck.) 128 342. _Sarcidiornis carunculata_ (Licht.). (Crested Duck.) 128 343. _Cairina moschata_ (Linn.). (Muscovy Duck.) 129 344. _Heteronetta melanocephala_ (Vieill.). (Black-headed Duck.) 130 345. _Querquedula cyanoptera_ (Vieill.). (Blue-winged Teal.) 130 346. _Querquedula flavirostris_ (Vieill.). (Yellowed-billed Teal.) 131 347. _Querquedula versicolor_ (Vieill.). (Grey Teal.) 131