228 ANATIDA, 
Central America. It is of accidental occurrence in the United States, and is a more 
strictly Neotropical form than any of the other Diving-Ducks mentioned in the present 
work. Grayson‘ states that he met with the species in some numbers, frequenting a 
small lake or lagoon near Tepic in Jalisco, as late as the month of June; the birds 
were evidently desirous of breeding in that locality, for the ovaries of some of the 
females shot were enlarged. He did not notice any examples in the neighbourhood 
of Mazatlan. 
According to Léotaud, N. dominicus is a social bird in Trinidad, but is essentially 
a water-loving species. When on land, it sits in an upright position, with its tail 
resting on the ground. This Duck is an excellent diver, and, when once on the wing, 
is of rapid flight, but it appears to find some difficulty in sustaining a great speed for 
any length of time. 
ERISMATURA. 
Erismatura, Bonap. Saggio Distr. Met. Agg. e Corr. p. 1483 (1832); Salvad. Cat. Birds Brit. Mus. 
xxvul. p. 441 (1895). 
A cosmopolitan genus differing from Nomonysx chiefly in having the nail of the bill | 
bent inwards. Seven species are known, of which four are Neotropical, but one only 
of these occurs within our limits. 
“1. Erismatura jamaicensis. 
Anas jamaicensis, Gmel. Syst. Nat. 1. 2, p. 519°. 
Erismatura rubida, Scl. P.Z.S. 1859, p. 893°; Scl. & Salv. This, 1859, p. 232°; P.Z.S. 1876, 
p. 403*; Dugés, La Nat. i. p. 143°; Lawr. Mem. Bost. Soc. Nat. Hist. 1. p. 315°; 
Ferrari-Perez, Pr. U.S. Nat. Mus. ix. p. 1747; Herrera, La Nat. (2) 1. pp. 187, 329°; 
Allen, Bull. Amer. Mus. N. H. v. p. 33°; Jouy, Pr. U.S. Nat. Mus. xvi. p. 789"; 
A. O. U. Check-l. N. Amer. Birds, 2nd ed. p. 59". 
Erismatura ferruginea, v. Frantz. J. f£. Orn. 1869, p. 378 . 
Erismatura jamaicensis, Salvad. Cat. Birds Brit. Mus. xxvii. p. 445 7°. 
Castanea, preepectore et pectore summo saturatioribus; corpore reliquo subtus albo, plumis basaliter 
brunnescenti-griseis ; corporis lateribus castaneis; subcaudalibus albis; rectricibus brunnescenti-nigris ; 
ala grisescenti-brunnea, tectricibus alarum et secundariis interioribus vix fulvo vermiculatis ; subalaribus 
albis, axillaribus brunneis, apicem versus albis ; pileo nuchaque nigris; collo laterali et gutture castaneis ; 
mento, loris, regione parotica et genis anticis pure albis, plagam albam magnam formantibus: rostro et 
regione periophthalmica cyaneis; pedibus sordide cinerascenti-cyaneis, palmis fuscis; iride corylina. 
Long. tota circa 16-0, ale 6:0, caude 3°8, culm. 1°75, tarsi 1-1. (Deser. maris adulti ex Duefias. Mus. 
nostr. ) 
©. Brunnea, plus minusve fulvo anguste vermiculata; alis et cauda sicut in mari coloratis; pileo brunneo, 
capitis lateribus et mento albidis, fascia fusca suboculari usque ad regionem paroticam producta; collo 
brunnescenti-griseo ; corpore subtus reliquo sicut in mari colorato, hypochondriis et corporis lateribus 
fuscis, albo marmoratis et marginatis: rostro fusco. Long. tota cirea 16:0, alee 5-6, caude 3°8, culm. 1°5, 
tarsi 1:1. (Deser. feminz adulte ex Duefias. Mus. nostr.) 
3 juv. femine adulte similis, sed fascia fusca faciali absente, genis albicanti-fulvis ; subcaudalibus albis. 
Hab. Nortu America, from Hudson’s Bay southward !!.—Mexico, Pachico, Sonora 
(Robinette °), San Luis Potosi (Jouy 1°), Mazatlan, Sinaloa, Tepic, Jalisco 
