382 MESSRS. SCLATER AND SALVIN ON ['^Pl*- ^> 



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. & Sal v. Nomencl, 

 p. 129. 



ChauleJasmus 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. 187.5, p. 381 (Cuba) ; Lawr. Mem. Bost. Soc. N. H. 

 ii. p. 315 (Mexico). 



Hah. Cuba (G?<»rf/.) ; Jamaica (ilf«rcA) ; Mexico (Grayso?!). 



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 al)un- 

 dant, 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 FuUgulcE ; 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. 7,. S. 1867, p. 335 (Cliili); Phil. & 

 Landb. Cat. Av. Chil. p. 42 ; Scl. & Salv. Nomencl. p. 129. 



Heteronetta melanocephala, Salvad. Atti Soc. Ital. viii. p. 374 

 (1866). 



Ftiligula melanocephala, Schl. Mas. 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 nigrica7iti-fiisca, rufescente minutisshne vermicu- 



lata ; capite colloque toto fuliginose nigris ; secnndariorum 



fascia terminali angusta alba ; subtus sordide alba, in pectore 



summo hypochondriis et crisso rufescente irrorata ; rostro ni- 



gricante, macula basali utrinque carnea ; pedibus cornels : long. 



tota 14-5, al(B 6*3, cauda 2'3, tarsi V\, rostri a rictu 2-0. 



Fem. pileo dorso concolori, genis fuscis nigro vermiculatis, gula 



et stria superciliari indistincta albidis diversa. 



Hah. Buenos Ayres {Azara) ; Chili prov. of Santiago (Ph. ^ 



Landb.); Brazil, Rio Grande do Sul {Max.): Mendoza. (TFeisskaupt). 



This peculiar Duck was first described by Azara, who " bought a 



pair in Buenos Ayres," where, however, Burmeister does not seem to 



