

than those of our common Dabchick {Sylbeocyclus minor), and can hardly, we should think, be 

 available for flight. The second and third primaries slightly exceed the first in length, and are 

 the longest in the wing. 





The tarsus of this Grebe is considerably shorter than the middle toe without the nail. As 

 in all species of the genus, it is excessively compressed, and terminates posteriorly in a double 

 series of scales, which, however, are much more prominent than in any other Grebe we are 

 acquainted with, so as to constitute two rows of projecting spines, which run up the back of the 

 tarsus and are particularly well developed at the proximal extremity. This striking peculiarity 

 has induced us to bestow upon the bird the generic name Centropelma* A somewhat similar 

 formation occurs in the common Dabchick^ but does not attain the same degree of development. 



Our figure of the Grebe is taken from the same specimen as that described by Mr. Gould, 

 which is now in Salvin and Godman's collection. The only other individual we have met with, 

 which is in the Gallery of the British Museum, was also obtained by Mr. Forbes on Lake Titicaca. 

 The species is, in all probability, exclusively confined to this enormous Alpine lake, which is 

 situated among the Bolivian and Peruvian Andes at an elevation of upwards of 12,800 feet 

 above the level of the sea. 



Mr. Coues has lately published a synopsis of the North American Podicipince^ The South 

 American species of this group with which we are acquainted are, besides the present, only 

 four : namely — 



1. PODICEPS MAJOR. 



Grebe de Cayenne, Buff. PL Enl. 404, f. i. (unde), Colymbus major, Eodd. : Qolymbus cayennensis, Gm. S. N. ii. 

 p. 593, Macas cornudo, Azara, Apunt. iii. p. 457, No. 443. Podiceps bicornis, Licht. Doubl. p. 88 : Hartl. 

 Ind. Az. p. 28: Burm, La Plata-Beise ii. p. 520: "Podiceps americanus]' Garnot, Mus. Paris. Podiceps 

 chilensis, Garnot, Zool. Voy. Coq. i. p. 601 : Darwin, Zool. Yoy. Beagle, iii. p. 137. Podiceps leucopterus, 

 King, Zool. Journ. ii. p. 101 : Jard. et Selb, 111. Orn. 1. 107 : Hartl. Naum. 1853, p. 218. Podiceps albicollis, 

 Less. Trait, p. 594. 



Hah, Cayenne (Buff.) : Brazil, Eio Grande (Mus. Paris) : Monte Video (Mus. Berol.) : Paraguay (Azara) : 

 Magellan's Straits (King) : Chili (Garnot). 



2. Podiceps calipae^eus. 



Podiceps calipareus, Less. Voy. Coq, Zool. p. 727, t. 45. Darwin, Zool. Beagle, iii. p. 136 ; Hartl. Naum. 1853, 

 p. 218 : Tech. F. P. Aves, p. 315 : Scl. P.Z.S. 1860, p. 389 : Abbott, Ibis, 1861, p. 162 : Scl. et Salv. P.Z.S. 

 1869, p. 158. 



Hab. Chili: Bolivia, Potosi, (d'Orb.) coasts of Southern Peru (Tschudi) : Interior of Peru, Tinta (Whitely) • 

 Falkland Isl, (Abbott) : Patagonia (Darwin). 



3. Podiceps bolla^di. 



Podiceps rollandi, Q. et G. Voy. Uranie, Zool. p. 133, t. 36: Darwin, Voy. Beagle iii. p. 137- Hartl Naum 

 1853, p. 218: Scl. P.Z.S. 1860, p. 389 : Abbott, Ibis, 1861, p. 162 : Scl. et Salv. P.Z.S. 1868, p. 146 • et 

 1869, p. 158. > l > 



Ilab. Falkland Islands (Darwin, Abbott) : Argentine Bep f (Hudson) : Chili (Hartlaub) ■ Int. of Peru (Whitely). 



4. Sylbeocyclus dominicus. 



Colymbus dominicus, Linn. S. N. i. p. 223. Max. Beitr. iv. p, 83£ : Spix Av. Bras. ii. p. 78, t. 101. Macas 

 menor, Azara, Ap. iii. p. 467, No. 445. Podiceps dominicus, Hartl. Ind. Az. p. 28 : Licht Doubl p 87 • 

 Gosse, Birds of Jam. p. 440: Scl. P.Z.S. 1857, p. 207, 1859, p. 369: Salle P.Z.S. 1857, p. 237 • Cab in 

 Schomb. Gman. m. p. 765. Scl. et Salv. Ibis, 1860, p. 278 : Taylor, Ibis, 1860, p. 317 : Lawr. Ann. Lye 

 N. Y. vii p. 334: Scl. et Salv. P.Z.S. 1864, p. 373: Gundlach, Eep. F. N. i. p. 386. Sylbeocyclus 

 dominicus, Coues, Pr. Ac. Phil. 1862, p. 232. 



Hab. Mexico (Salle) : Cuba(G^^.) : Jamaica ( Gosse) ■ San Domingo (Salle) : Guatemala (Salvin) : Honduras 

 (Taylor) : Veragua (Arce) : Panama (McLeannan) : Caraccas (Levraud) : Brazil (Spix, Max.) : Paraguay 

 (Azara). z ° J 



* liivrpov spiny et iri\}ia plant a pedis, 

 May, 1869. 



f Proc. Acad. Sc ? Phil. 1862, p. 226, et p. 404. 

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