NO. 9 BIRDS OF ISLA COIBA, PANAMA—WETMORE 71 
LEPTOPOGON AMAUROCEPHALUS Tschudi: Brown-capped Leptopogon, 
Mofiona Coronimorena 
Leptopogon amaurocephalus TscHunI, Fauna Peruana, Aves, 1846, p. 162. (Sao 
Paulo, Brasil.) 
These birds were found on only two occasions, on January 31 and 
February 3, inland in high forest, on a broad ridge at about 500 feet 
elevation. On the first day two moved rather slowly through the 
middle branches, where it was difficult to see them in the dim light 
filtering through the leaves high overhead. One, that in the hand 
proved to be a male in breeding condition, called at intervals, a low 
trilling pree-ee-ee, while it trembled its partly open wings. On the 
second occasion another breeding male was taken in the same general 
area as it moved quietly among the branches above the higher under- 
growth. In life, from this limited observation, there was little to 
distinguish these birds from the orange-crested elaenia (Myiopagis 
viridicata) that also ranged in this dimly lighted zone in the forest, 
as the two are quite similar in form and movement. In the hand, the 
relatively small feet of the leptopogon immediately attract attention. 
Following is a description of bill, feet, and eyes taken from the 
adult male shot January 31: Iris light brownish yellow; maxilla and 
tip of mandible dusky neutral gray ; base of mandible dull Marguerite 
yellow ; tarsus and toes neutral gray ; claws fuscous. I was interested 
to note that the elongated median apterion, characteristic of birds of 
this and related groups, found down the center of the expanded 
dorsal feather tract, was so narrow that close scrutiny was required 
to distinguish it. 
The two specimens differ so definitely from the race of this species 
found on the mainland of Panama that I have no hesitance in 
describing the Coiba Island bird as a race new to science. 
LEPTOPOGON AMAUROCEPHALUS IDIUS subsp. nov. 
Characters—Generally similar to Leptopogon amaurocephalus 
faustus Bangs *° but decidedly grayer throughout ; much paler yellow 
below, and more grayish green above; no prominent dark area on 
the auriculars ; wing bars paler ; under wing coverts lighter. 
Description—Type, U.S.N.M. No. 460975, male, Isla Coiba, 
Panama, collected Feb. 3, 1956, by A. Wetmore (orig. No. 20587) : 
Small feathers immediately behind nostrils dull white; pileum clove 
brown, the feathers margined indistinctly with sepia ; hindneck, back, 
scapulars, and rump grayish grape green; upper tail coverts light 
20 Leptopogon amaurocephalus faustus Bangs, Auk, vol. 24, no. 3, July 1907, 
p. 300. (Boruca, Costa Rica.) 
