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Show 3S2 MESSRS. SCLATER AND SALVIN ON [Apr. 4, absence of the conspicuous white face-markings and the small crest. It is, no doubt, the Anas specularoides of King. 5. ANAS STREPERA. Anas strepera, Linn. S. N. i. p. 100 (1766); Scl. & Salv. Nomencl. p. 129. Chaulelasmus streperus, Baird, B. of N. Amer. p. 782; March, Pr. Ac. Phil. 1864, p. 72 (Jamaica) ; Gundl. Repert. F.-N. i. p. 389, et J. fur Orn. 1875, p. 381 (Cuba) ; Lawr. M e m . Bost. Soc. N. H. ii. p. 315 (Mexico). Hab. Cuba (Gundl.) ; Jamaica (March) ; Mexico (Grayson). The occurrence of a single male bird of this species in the market of Havana is the sole authority for its admission into the list of Cuban birds. In Jamaica, however, Mr. March says, it is sometimes abundant, but of irregular occurrence. Its presence in Mexico is confined to the N.W. provinces, where Grayson observed it. Genus 5. HETERONETTA. Type. Heteronetta, Salvadori, Atti de la Soc. Ital. d. Sci. Nat. viii. p. 574 (1865) H. melanocephala. This is certainly an aberrant form of Anas in many respects; and Dr. Salvadori is probably correct in isolating it. Schlegel even goes so far as to put it with the Fuligula ; but before accepting this view, we require a knowledge of its tracheal formation. HETERONETTA MELANOCEPHALA. Pato cabeza negra, Az. Apunt. no. 438 (Buenos Ayres), unde Anas melanocephala, Vieill. N. D. v. p. 163 (1816), et Enc. Meth. p. 354 (1823); Hartl. Ind. Az. p. 28; Cassin, Gilliss's Exp. ii. p. 202, t. xxv. (1856); Scl. P. Z. S. 1867, p. 335 (Chili); Phil. & Landb. Cat. Av. Chil. p. 42 ; Scl. & Salv. Nomencl. p. 129. Heteronetta melanocephala, Salvad. Atti Soc. Ital. viii. p. 374 (1866). Fuligula melanocephala, Schl. Mus. des P.-B. Anseres, p. 32. Anas nigriceps, Licht. in Mus. Berol. ; Nomencl. p. 101. Anas atricapilla, Merrem, inErsch.u.Grub. Enc. sect. i. vol. xxxv. p. 26. Supra saturate nigricanti-fusca, rufescente minutissime vermiculata ; capite colloque toto fuliginose nigris; secundariorum fascia terminali angusta alba ; subtus sordide alba, in pectore summo hypochondriis et crisso rufescente irrorata; rostro nigricante, macula basali utrinque carnea ; pedibus cornels : long. tota 14*5, ala 6*3, cauda 2*3, tarsi 1*1, rostri a rictu 2*0. Fern, pileo dorso concolori, genis fuscis nigro vermiculatis, gula et stria superciliari indistincta albidis diversa. Hab. Buenos Ayres (Azara); Chili prov. of Santiago (Ph. $• Landb.); Brazil, Rio Grande do Sul (Max.); Mendoza ( Weisshaupt). This peculiar Duck was first described by Azara, who " bought a pair in Buenos Ayres," where, however, Burmeister does not seem to |