BIRDS OF NORTH AND MIDDLE AMERICA. 107 
cc. Wing-coverts not distinctly, if at all, spotted or barred with black. 
Myrmeciza boucardi swainsoni, adult female and young (extralimital), 
Myrmeciza boucardi panamensis, young male (p. 108).¢ 
bb. Throat gray or dusky; chest and abdomen brown or tawny. 
c. Smaller (wing 62-71, tarsus 26-31); pileum slaty or blackish, in contrast with 
chestnut or chestnut-brown of back; tail brown. 
d. All the wing-coverts with a terminal spot or dot of white; under parts paler, 
becoming buffy on abdomen....Myrmeciza cassini, adult female (p. 110). 
dd. Wing-coverts uniform brown (except, sometimes, a few small dots of white 
near bend of wing); under parts darker, the abdomen brown. (Myrme- 
ciza exsul.) 
e. General color of under parts much duller, the chest vandyke brown. 
Myrmeciza exsul exsul, adult female (p. 111). 
ee. General color of under parts much brighter, the chest bright chestnut or 
tawny-chestnut...Myrmeciza exsul occidentalis, adult female (p. 113). 
cc. Larger (wing 75-81, tarsus 32-35); tail blackish; pileum dark brown, like 
back, etc. 
d. Forehead and lores densely (normally) feathered; chin to auricular region 
grayish dusky; throat dull grayish, chest slaty olive; back chestnut- 
brown; tail blackish brown; culmen, 19.5. 
Myrmeciza immaculata, adult female (extralimital). 
dd. Forehead and lores scantily feathered; chin to auricular region dull black; 
lower throat, chest, and other under parts deep vandyke brown; back, 
etc., dark vandyke brown; tail black; culmen, 20.5-22. 
Myrmeciza zeledoni, adult female (p. 114). 
MYRMECIZA BOUCARDI PANAMENSIS Ridgway. 
WHITE-BELLIED ANTBIRD. 
Adult male—Pileum and hindneck gray or slate-gray, at least 
anteriorly and laterally, the gray paler on sides of occiput (supra- 
auricular region), the crown, occiput, and hindneck usually more 
or less overlaid by chestnut-brown (burnt-umber or vandyke), some- 
times uniformly of this color; rest of upper parts plain bright cin- 
namon-rufous or chestnut-rufous, the color paler and more tawny 
on primaries; anterior margin of lesser wing-covert area white or 
pale buffy, immediately followed by more or less of black spotting; 
middle wing-coverts sometimes with an indistinct subterminal bar 
of dusky; loral, suborbital, auricular, and malar regions, chin, 
throat, and chest uniform black, the first mixed with gray anteriorly; 
lower chest and breast (except medially) and sides of upper chest 
plain gray (no. 6 or no. 7), passing posteriorly into tawny-buff or 
clay color on flanks; median portion of lower chest and breast, 
together with abdomen, white; under tail-coverts tawny or tawny- 
ochraceous; smaller under wing-coverts white or buffy white, those 
on carpal region with more or less distinct central or mesial marks 
of dusky; inner webs of remiges broadly edged with vinaceous- 
cinnamon; bill black; legs and feet dull yellowish or pale yellowish 
@ The distinctive characters of the several forms of this species are not very evident 
in females and immature birds. I have not seen the adult female of M. b. boucardi. 
