NO. 9 BIRDS OF ISLA COIBA, PANAMA—WETMORE 45 
Three taken on January Io and 15 are typical of the present race, 
marked by light-colored rump and upper tail coverts. 
Family TRocHILIDAE: Hummingbirds 
PHAEOCHROA CUVIERII SATURATIOR (Hartert): Cuvier’s Hummingbird, 
Colibri de Cuvier 
Aphantochroa cuvieri saturatior Hartert, Bull. Brit. Orn. Club, vol. 12, Dec. 
30, 1901, p. 33. (Coiba Island, Panama.) 
This large species was found only in the stand of white mangroves 
in the swampy area bordering the mouths of the San Juan and 
Catival Rivers. They came so quietly among the other hummers to 
feed at flowering trees that, with their dull coloration, they attracted 
little attention, and it was only when they were in clear view that 
they were distinguished by their size. They were not common, and 
it required much watching to collect the two males and two females 
that I obtained. 
These four bear out fully the characters assigned in the original 
description, being decidedly darker both above and below when com- 
pared with the two races of this species known respectively from 
eastern and western Panama. Measurements are as follows: Males 
(2 specimens), wing 78.7, 75.8, tail 45.5, 45.0, culmen from base 24.7, 
25.6 mm. Females (2 specimens), wing 70.2, 74.1, tail 46.7, 45.2, 
culmen from base 25.9, 24.7 mm. 
Hartert believed that a longer bill might be one of the characters 
of this race but this is not true. 
CHLOROSTILBON ASSIMILIS Lawrence: Allied Emerald, 
Colibri Esmeraldino 
Chlorostilbon assimilis LAwrENcE, Ann. Lyc. Nat. Hist. New York, vol. 7, Janu- 
ary 1861, p. 292. (Atlantic side of the Isthmus of Panama, along the line of 
the Panama Railroad.) 
This was the least prominent of the hummingbirds, the few noted 
being found in the forest, or at the forest border. The three males 
and two females secured do not differ from mainland specimens. On 
January 16, when I obtained a pair in swampy woods along the Rio 
Catival, I found that the female was laying. 
LEPIDOPYGA COERULEOGULARIS COERULEOGULARIS (Gould): 
Sapphire-throated Hummingbird, Colibri Zafirino 
Trochilus coeruleogularis Goutp, Proc. Zool. Soc. London, pt. 18, 1850 (Feb. 
28, 1951), p. 163. (Near David, Chiriqui, Panama.) 
These handsome hummingbirds were encountered only in the bor- 
ders of the mangrove swamps, where they were feeding at flowering 
trees. They seemed rather quiet, and also somewhat timid as they 
