152 PHALACROCORACIDA. 
Hab. Paciric Coasts or Nortuern Asia AND Norta AMERICA, south to Cape San 
Lucas 7.—Mextico, Mazatlan ®, Valley of Mexico ( Herrera‘). 
This species belongs to the group of the genus which possesses twelve tail-feathers. 
In breeding-plumage it has two distinct crests, one on the crown, and a second on the 
nape, and a large white patch on each flank. The forehead is feathered and the wing- 
coverts and scapulars are greenish and violet-bronze with green reflections*. In 
non-breeding plumage it may be recognized by its greenish-black under surface and 
feathered forehead, and by the absence of black marginal bands to the feathers of the 
back and scapulars, which are greenish and purple-bronze with green reflections, the 
neck being deep violet-blue °. 
Three races of this Cormorant are admitted by American ornithologists, of which 
two, P. pelagicus, and its ally, P. robustus, are confined to the Western Pacific—the 
first inhabiting the Aleutian Islands, the second extending from Alaska to Washington 
Territory, whence it is replaced southward by P. resplendens, which is the form said to 
extend to the coast of Mazatlan. Mr. Ogilvie Grant gives a series of measurements 
to show that the difference in size of bill, on which these forms have been separated, 
is not a constant feature, and that in this respect the three races merge into one. We 
therefore follow him in uniting them. 
Beyond the fact that the species is said to reach Cape San Lucas and Mazatlan, and 
the statement of Herrera! that it occurs in the Valley of Mexico, we have no notes on 
its occurrence in any other part of the Central-American region. This author also 
mentions P. mexicanus as an inhabitant of the Valley of Mexico, so that it is evident 
that he was acquainted with two species, and his identification of P. pelagicus is 
therefore probably correct. 
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2. Phalacrocorax auritus. 
Carbo auritus, Less. Traité d’Orn. p. 605°. 
Phalacrocorax auritus, Ogilvie Grant, Cat. Birds Brit. Mus. xxvi. p. 833°, 337°, 370¢. 
Phalacrocorax dilophus, A. O. U. Check-l. N. Amer. Birds, 2nd ed. p. 42°; Ridgw. Man. 
N. Amer. Birds, 2nd ed. p. 78 °. 
Phalacrocorax floridanys (Audub.), Salv. Ibis, 1864, p. 374" ; 1866, p. 200°; 1889, p. 376°. 
Phalacrocorax dilophus floridanus, A. O. U. Cheek-l. N. Amer, Birds, 2nd ed. p. 42°; Ridgw. 
Man. N. Amer. Birds, 2nd ed. p. 78”. 
Pil. estiv. Supra bronzino-brunneus, plumis late nigro marginatis ; primariis nigricantibus ; dorso postico, 
uropygio et supracaudalibus chalybeo-nigris ; cauda nigra; crista elongata supraciliari utrinque nigra ; 
pileo cum collo et corpore subtus toto nigris, chalybeo-viridi vix nitentibus; maxilla nigra, griseo vel flavo 
lateraliter marmorata, mandibula flavescente vel pallide cyanea, fusco marmorata; loris, regione oculari 
et gutturis partibus nudis lete aurantiacis ; palpebris et palato late cyaneis; pedibus nigris; iride late 
graminea. Long. tota circa 29-0, ale 12:0, caude 5:9, culm. 2-1, tarsi 2:15. (Descr. maris adulti ex 
Tarpon Springs. Mus. nostr.) 
mari similis, sed paullo minor. 
Ptil. hiem. similis ptilosi estive, sed cristarum plumis absentibus; loris gulaque nudis flavis, palpebris et 
palato minime cyaneis. 
