Carriker : List of the Birds of Costa Rica. 437 



The presence in the list of this species depends entirely on the single 

 record given by von Frantzius in 1869, which has been repeated by 

 Zeledon in his Catalogue and by Salvin and Godman in the Biologia. 

 There are records from Guatemala and Colombia, while Mr. Bangs 

 has a specimen from Divala, Chiriqui, so that there is no apparent 

 reason why the bird should skip Costa Rica in its migrations, but it is 

 evidently a very rare straggler there. 



no. Marila affinis (Eyton). 



Fu!i?ula ^hh Eyton, Monogr. Anat., 1838, 157. — Sclater and Salvin, P. 



Z. S., 1876, 400 (Lawrence's record). — Salvadori, Cat. Birds Brit. Mus., 



XXVII, 1895,360. — Salvin and GoDiMAN, Biol. Centr.-Am., Aves, III, 



1902, 223 (record of Lawrence cited). 

 Fulix affinis Lawrence, Ann. Lye. N. Y., IX, 1868, 143 (San Antonio 



[Frantzius]). 

 Aythya affinis Zeledox, An. Mus. Nac. de C. R., I, 1887, 131 (probably a 



repetition from Lawrence's Catalogue). 



Like the preceding species, this bird seems to have been taken but 

 once, by Frantzius at San Antonio. 



in. Nomonyx dominicus (Linnaeus). 



Anas dominica Linnaeus, Syst. Nat., ed. 12, 1766, 201. 



Nomonyx dominicus Ridgway, Proc. U. S. Nat. Mus., Ill, 1880, 15. — Salva- 

 dori, Cat. Birds Brit. Mus., XXVII, 1895, 438. — Salvin and Godman, 

 Biol. Centr.-Am., Aves, III, 1902, 227. 



Nomonyx dominicus Cherrie, Expl. Zool. en C. R., 1891-2, 1893, 5^, in text 

 (Laguna de Sierepe). 



U. S. Nat. Museum : Laguna de Coris, Nov. 25, 9. 



John E. Thayer Collection : Costa Rica, cT and 9 (Underwood). 



C. H. Lankester Collection : Las Concovas, one specimen, 1908. 



The only published record for the occurrence of the Masked Duck in 

 Costa Rica is that by Mr. Cherrie (cited above) and this seems to have 

 been overlooked by all subsequent authors. Mr. Cherrie says that he 

 saw two on the Laguna de Sierepe, which was the first record for 

 Costa Rica and that subsequently (no date given) he took two speci- 

 mens on the Laguna de Ochomogo, near Cartago. 



112. Erismatura jamaicensis (Gmelin). 



Anas jamaicensis Gmelin, Syst. Nat , I, 2, 1788, p. 519. 

 Erismatura ferruginea Frantzius, Jour, fiir Orn., 1869, 378 (Irazu). 

 Erismatura rubida Zeledon, An. Mus. Nac. de C. R., I, 1887, 132. 

 Erismatura jamaicensis, Salvadori, Cat. Birds Brit. Mus., XXVII, 1895,445. 

 — Salvin and Godman, Biol. Centr.-Am., Aves, III, 1902, 228. 



