417. _Larus maculipennis_, Licht. (Spot-winged Gull.) 198 418. _Larus cirrhocephalus_, Vieill. (Grey-capped Gull.) 201 Order XVII. PYGOPODES. Fam. LI. PODICIPEDIDÆ, or GREBES. 419. _Æchmophorus major_ (Bodd.). (Great Grebe.) 202 420. _Podiceps caliparæus_, Less. (Bright-cheeked Grebe.) 204 421. _Podiceps rollandi_, Quoy et Gaim. (Rolland's Grebe.) 204 422. _Tachybaptes dominicus_ (Linn.). (American Dabchick.) 205 423. _Podilymbus podiceps_ (Linn.). (Thick-billed Grebe.) 206 Order XVIII. IMPENNES. Fam. LII. APTENODYTIDÆ, or PENGUINS. 424. _Spheniscus magellanicus_ (Forst.). (Jackass Penguin.) 206 Order XIX. CRYPTURI. Fam. LIII. TINAMIDÆ, or TINAMOUS. 425. _Crypturus obsoletus_, Temm. (Brown Tinamou.) 207 426. _Crypturus tataupa_, Temm. (Tataupa Tinamou.) 208 427. _Rhynchotus rufescens_ (Temm.). (Great Tinamou.) 209 428. _Nothoprocta pentlandi_ (Gray). (Pentland's Tinamou.) 210 429. _Nothoprocta cinerascens_ (Burm.). (Cinereous Tinamou.) 210 430. _Nothura maculosa_ (Temm.). (Spotted Tinamou.) 211 431. _Nothura darwini_, Gray. (Darwin's Tinamou.) [Plate XX.] 213 432. _Calodromas elegans_ (d'Orb. et Geoffr.). (Martineta Tinamou.) 214 Order XX. STRUTHIONES. Fam. LIV. RHEIDÆ, or RHEAS. 433. _Rhea americana_, Lath. (Common Rhea.) 216 434. _Rhea darwini_, Gould. (Darwin's Rhea.) 219 APPENDIX 221 I. List of the principal Authorities upon the Ornithology of the Argentine Republic referred to in the present Work 221 II. List of some of the principal Localities where Collections have been made, mentioned in this Work 231 INDEX 233 LIST OF PLATES IN VOL. II. Plate Page XI. CHÆTOCERCUS BURMEISTERI 2 XII. HYDROPSALIS FURCIFERA 15 XIII. COCCYZUS CINEREUS 38 XIV. CONURUS MOLINÆ 43 XV. BOLBORHYNCHUS AYMARA 46 XVI. BUTEO SWAINSONI 59 XVII. ARDETTA INVOLUCRIS 101 XVIII. CYGNUS NIGRICOLLIS 124 XIX. RALLUS MACULATUS 148 XX. NOTHURA DARWINI 213 ARGENTINE ORNITHOLOGY. Order II. MACROCHIRES. Fam. XX. TROCHILIDÆ, or HUMMING-BIRDS.