It will be seen that in the following pages, as in the first volume, we have availed ourselves liberally of the information on Argentine birds contained in the writings of Dr. Burmeister, Mr. Barrows, and Mr. Gibson. To all of these gentlemen we wish to offer our most sincere thanks, together with apologies for the liberty we have taken. We have likewise to express our high estimation of the valuable notes which we have extracted from the published writings of the late Henry Durnford and Ernest William White, both most promising Naturalists, and both alike lost to Science at an early age. Nor must we omit to record our thanks to Hans, Graf von Berlepsch, of Münden, Mr. Walter B. Barrows, and Mr. Frank Withington, and other friends and correspondents who have aided us by information and by the loan of specimens. To the Zoological Society of London and to Mr. Henry Seebohm we are likewise much indebted for the loan of the woodcuts of which impressions are contained in these volumes. P. L. S. _February 1, 1889._ CONTENTS OF VOL. II. Order II. MACROCHIRES. Fam. XX. TROCHILIDÆ, or HUMMING-BIRDS. Page 230. _Oreotrochilus leucopleurus_, Gould. (White-sided Humming-bird.) 1 231. _Chætocercus burmeisteri_, Scl. (Burmeister's Humming-bird.) [Plate XI.] 2 232. _Sparganura sappho_ (Lesson). (Sappho Humming-bird.) 3 233. _Petasophora serrirostris_ (Vieill.). (Violet-eared Humming-bird.) 3 234. _Patagona gigas_ (Vieill.). (Giant Humming-bird.) 4 235. _Calliperidia furcifera_ (Shaw). (Angela Humming-bird.) 5 236. _Leucippus chionogaster_ (Tsch.). (White-breasted Humming-bird.) 7 237. _Leucochloris albicollis_ (Vieill.). (White-throated Humming-bird.) 7 238. _Chrysuronia ruficollis_ (Vieill.). (Golden-tailed Humming-bird.) 8 239. _Hylocharis sapphirina_ (Gm.). (Red-throated Humming-bird.) 8 240. _Chlorostilbon splendidus_ (Vieill.). (Glittering Humming-bird.) 9 Fam. XXI. CYPSELIDÆ, or SWIFTS. 241. _Hemiprocne zonaris_ (Shaw). (Ringed Spine-tailed Swift.) 11 Fam. XXII. CAPRIMULGIDÆ, or GOATSUCKERS. 242. _Podager nacunda_ (Vieill.). (Nacunda Goatsucker.) 12 243. _Chordeiles virginianus_ (Gm.). (Whip-poor-Will.) 13 244. _Antrostomus parvulus_ (Gould). (Little Goatsucker.) 14 245. _Stenopsis bifasciata_ (Gould). (Wing-banded Goatsucker.) 14 246. _Hydropsalis furcifera_ (Vieill.). (Fork-tailed Goatsucker.) [Plate XII.] 15 247. _Heleothreptus anomalus_ (Gould). (Short-winged Goatsucker.) 16