BIRDS OF NORTH AND MIDDLE AMERICA. 107 



cc. "Wing-coverts not distinctly, il" 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 al^domen brown or tawny, 

 c. Smaller (wing 62-71, tarsiis 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). 



d(l. \\'ing-co verts uniform brown (except, sometimes, a few small dots of white 

 near bend of wing); under parts darker, the abdomen brown. (Myrme- 

 ciza exsul.) 

 c. General color of under parts much duller, the chest Vandyke brown. 



Myrmeciza exsul exsul, adult female (p. 111). 



ce. 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 lilackish; 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- 



l)rown; tail blackish brown; culmen, 19.5. 



Myrmeciza immaculata, adult female (extralimital). 

 dd. Forehead and lores scantily featliered; chin to auricular region dull black; 

 lower throat, chest, and other under j^arts deep Vandyke l)rown; 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 ])y chestnut-l^rown (burnt-umber or Vandyke), some- 

 times uniformly of this color; rest of upper parts plain briglit cin- 

 namon-rufous or chestnut-rufous, tlie color paler and more tawny 

 on primaries; anterior margin of lesser wing-covert area white or 

 pale bufly, immediately followed by more or less of black spotting; 

 middle v/ing-coverts sometimes with an indistinct subterminal l)ar 

 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 witli abdomen, white; under tail-coverts tawny or tawny- 

 ochraceous; smaller under wdng-co verts wldte or bufty 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 yellomsh 



" The distinctive cluiiacUn's of the several forms of this species are not very evident 

 in females and immature birds. 1 have not .seen the adult female of M. b. boucardi. 



