NO. 9 BIRDS OF ISLA COIBA, PANAMA—WETMORE 19 
FLORIDA CAERULEA (Linnaeus): Little Blue Heron, Garceta Azul (adults), 
Garceta Blanca (immature birds) 
Ardea caerulea LINNAEUS, Systema naturae, ed. 10, vol. 1, 1758, p. 143. (South 
Carolina.) 
The immature birds in white plumage, with dark gray-green legs 
and bills, were common along the beaches of Bahia Damas, where 
they often gathered in little flocks. When small fishes came into the 
shallows with the incoming tide the herons often became quite ac- 
tive, dancing about gracefully in pursuit of this food. Occasionally 
I noted a bird in slate-blue adult dress, rarely one pied variously in 
slate and white, but most were immature individuals in white plum- 
age. About January 20 there was a considerable increase in their 
numbers, and they remained in this greater abundance until the close 
of my stay. January 27 I recorded 50 congregated on the flats near 
Hato, with others scattered along the water beyond. 
BUTORIDES VIRESCENS MACULATUS (Boddaert): Green Heron, 
Martinete 
Cancroma maculata BoppaErt, Table des planches enluminéez, 1783, p. 84. (Mar- 
tinique. ) 
January 20 I shot a female in the mangroves at the mouth of Rio 
Catival, the only one recorded on Coiba. The bird is adult as shown 
by the pointed wing coverts and their buffy edgings, and has the 
wing in partial molt. The next to the outermost primary, somewhat 
worn at the tip, is still in place in each wing, allowing a fairly ac- 
curate wing measurement of 166 mm. The brown on the side of the 
neck is quite dark, which, in conjunction with the short wing, places 
it in the subspecies maculatus, it being too small for migrant virescens 
of the north. The fact that the color of the under surface of the body 
is pale like that of mainland birds suggests that it may be a wanderer 
from some point on the Isthmus. It would be expected that a resident 
population on Coiba, if there is one, would have darkened coloration, 
on the order of that found in the subspecies Butorides v. margarito- 
philus of the Pearl Islands in the Gulf of Panama. 
NYCTANASSA VIOLACEA CALIGINIS Wetmore: Yellow-crowned Night 
Heron, Garzota de Corona Amarilla 
Nyctanassa violacea caliginis WrtTMorE, Proc. Biol. Soc. Washington, vol. 59, 
Mar. 11, 1946, p. 49. (San José Island, Archipiélago de las Perlas, Panama. ) 
Near the mouth of the Rio Catival we obtained an adult male 
January 27, and saw several others. Apparently they are not common 
