I04 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
in the undergrowth of the high gallery woodland across the central 
part of the island. It was found low down near the ground, in pairs 
or small groups, often in the same localities as the streaked saltator. 
Probably it was some supply of berries or other food that brought 
the two together, though their choice of haunt was identical. In the 
dim light of the forest areas it was often difficult to see the chen-chen 
because of its dark coloration, and its lack of any conspicuous color 
pattern. At this season they were not singing their labored songs. 
The bird of Coiba is described in the following paragraphs. 
ARREMONOPS CONIROSTRIS VIRIDICATA subsp. nov. 
Characters—Similar to Arremonops conirostris striaticeps (La- 
fresnaye)** but decidedly darker; white on lower surface less in 
extent, with corresponding increase in gray on breast and sides, which 
are darker; under tail coverts darker buff; dorsal surface darker 
throughout, both in the gray on the head, and in the green of the 
rest of the dorsal plumage; wings and tail decidedly darker. 
Description.—Type, U.S.N.M. No. 461362, male, from Isla Coiba, 
Panama, collected January 13, 1956, by A. Wetmore (orig. No. 
20209): Broad lateral crown stripes, extending posteriorly onto the 
upper hindneck, black ; center of crown and of upper hindneck neutral 
gray ; back, scapulars, rump, and upper tail coverts Saccardo’s olive ; 
lesser and middle wing coverts buffy citrine, with the outer webs 
washed with old gold; greater coverts buffy citrine, edged with old 
gold ; remiges Chaetura drab ; tertials, secondaries, and inner primaries 
edged with Dresden brown; outer secondaries and alula edged with 
mignonette green; rectrices between Dresden brown and mummy 
brown; space behind nostril dull white, extended posteriorly as a 
neutral gray superciliary that broadens behind the eye and extends 
onto the side of the neck; feather circlet on edge of upper lid and 
on center of lower lid dull white ; loral area and a narrow line extend- 
ing from the posterior margin of the eye, including the feathers on 
the edge of the lower eyelid except those in the center, black; rest of 
side of head, including the ramal area, neutral gray; throat and 
upper foreneck white; lower foreneck, breast, and anterior area of 
sides light neutral gray ; center of abdomen white; flanks light brown- 
ish olive, merging anteriorly with light neutral gray of sides; under 
tail coverts Isabella color; edge of wing and outer under wing 
coverts cadmium yellow, mixed with light orange-yellow ; inner under 
33 Embernagra striaticeps Lafresnaye, Rev. Mag. Zool., ser. 2, vol. 5, Febru- 
ary 1853, p. 61. (Panama.) 
