NO. 9 BIRDS OF ISLA COIBA, PANAMA—WETMORE 85 
the leaves and twigs, almost as quickly as wood warblers, and when 
seen often appear very close at hand. Occasionally I found them 
feeding on small drupes of fruiting trees. The yellowish-white iris 
of the adult birds is often apparent as they climb and hop among the 
smaller branches. The darker colored immature birds have dark 
eyes. The song, given in low tones, usually has three similar notes, 
swee, swee, swee, which are easily imitated by whistling. 
The birds of Coiba described below are so much darker than the 
nearby mainland race that they might almost be treated as a distinct 
species. 
HYLOPHILUS FLAVIPES XUTHUS subsp. nov. 
Characters —Similar to Hylophilus flavipes viridiflavus Lawrence *4 
but bill heavier; much darker below, being definitely buffy instead 
of yellow; sides decidedly darker ; darker green above. 
Description—Type, U.S.N.M. No. 461170, male, Isla Coiba, 
Panama, collected Jan. 11, 1956, by A. Wetmore (orig. No. 20155) : 
Pileum, hindneck, back, and scapulars dark citrine; rump citrine; 
wing coverts dull citrine; primaries and secondaries Chaetura black, 
the outer webs edged with serpentine green; tail olive-citrine; lores 
faintly olive-buff ; sides of head citrine-drab ; chin dull white ; throat 
and upper foreneck light yellowish olive, merging with the light olive 
lake of the chest; lower breast, abdomen, and under tail coverts 
between primuline yellow and wax yellow; flanks between strontian 
yellow and yellowish citrine ; edge of wing, under wing coverts, and 
margins of inner webs of remiges barium yellow. Maxilla buffy 
brown ; mandible deep olive-buff ; tarsus and toes wood brown (from 
dried skin). 
Measurements.—Males (7 specimens), wing 55.8-58.3 (57.5), tail 
47.0-50.9 (48.4), culmen from base 14.3-15.0 (14.7), tarsus I7.4-19.0 
(18.6) mm. Females (6 specimens), wing 54.4-56.7 (55.9), tail 45.2- 
49.3 (47.8), culmen from base 14.6-16.1 (15.1), tarsus 18.2-19.4 
(18.6) mm. 
Type, male, wing 57.9, tail 48.1, culmen from base 14.3, tarsus 
17.4 mm. 
Range.—Isla Coiba, off the Pacific coast of Veraguas, Panama. 
Remarks.—A juvenile female with wings and tail not quite fully 
grown is more highly pigmented than the adults, being darker above 
and below, with a wash of ochraceous-orange on the abdomen and 
24 Hylophilus viridiflavus Lawrence, Ann. Lyc. Nat. Hist. New York, vol. 7, 
1861, p. 324. (Atlantic slope near Panama Railroad, Canal Zone, Panama.) 
