106 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
cc. Abdomen slate color or gray. 
d. Back with a large concealed patch of white; sexes nearly alike in color. 
e. Throat uniform black. (Costa Rica and western Panamé.) 
. Myrmeciza lemosticta, adult male (p. 109). 
ee. Throat spotted or barred with white. 
Myrmeciza leemosticta, adult female (p. 109). 
dd. Back without a concealed white patch; sexes very different in color. 
e. All the‘wing-coverts with a white apical spot or dot; tail relatively shorter. 
f. Darker, the back, rump, etc., deep mummy or vandyke brown, head 
(all round) black, chest, breast, and abdomen blackish slate. (North- 
western Ecuadér)...Myrmeciza maculifer, adult male (extralimital).¢ 
Jf. Paler, the back, rump, etc., mars brown, head (all round) blackish slate, 
chest, breast, and abdomen slate-gray. (Eastern Panamé and adja- 
cent portion of Colombia)....Myrmeciza cassini, adult male (p. 110). 
ee. Wing-coverts (except, sometimes, a few of the more anterior lesser coverts) 
without white spots or dots. (Myrmeciza exsul.) 
f. Slightly darRer or duller in general coloration, with slate color of under 
parts usually not paler on abdomen. (Caribbean slope of Panamé, 
Costa Rica, and Nicaragua.) 
Myrmeciza exsul exsul, adult male (p. 111). 
Jf. Slightly brighter in coloration, with slate color of under parts usually 
paleronabdomen. (Pacific slope of Costa Rica and western Panamé). 
Myrmeciza exsul occidentalis, adult male (p. 113). 
bb. Back, wings, etc. (whole upper parts), also entire under parts, uniform black, 
the anterior lesser wing-coverts white. 
c. Forehead and lores densely (normally) feathered; white area on anterior mar- 
gin of wing narrower; tarsus 31.5-32. (Central Colombia.) 
Myrmeciza immaculata, adult male (extralimital).? 
cc. Forehead and lores scantily feathered; white area on anterior margin of wing 
broader; tarsus 33.5-36. 
d. White area on anterior portion of wing smaller, involving only marginal 
lesser coverts; tarsus 33.5-34.5. (Costa Rica and western Panam4.) 
Myrmeciza zeledoni, adult male (p. 114). 
dd. White area on anterior portion of wing much larger, involving nearly the 
whole of the lesser covert area; tarsus 36. (Western Ecuadér to central 
Colombia.).......---- Myrmeciza berlepschi, adult male (extralimital).¢ 
aa. Under parts without any black. 
b. Throat and chest buff or ochraceous-buff (the former sometimes whitish); abdo- 
men white. (Myrmeciza boucardi.) 
c. Wing-coverts distinctly spotted or barred with black. 
d. Spots or bars on wing-coverts larger, very conspicuous. 
Myrmeciza boucardi griseipectus, adult female (extralimital). 
dd. Spots or bars on wing-coverts smaller, inconspicuous. 
Myrmeciza boucardi panamensis, adult female (p. 108). 
® Myrmelastes exsul maculifer Hellmayr, Novit. Zool., xiii, no. 2, July 10, 1906, 340, 
342 (Paramba, n. w. Ecuad6r, 3,500 ft.; coll. Tring Mus.).— M[yrmelastes] maculifer 
Ridgway, Proc. Biol. Soc. Wash., xxi, Oct. 20, 1908, 194, in text. 
b T{hamnophilus] immaculatus Lafresnaye, Rev. Zool., viii, Sept., 1845, 340 (Bogot4, 
Colombia; types now in coll. Bost. Soc. N.H.). See Ridgway, Proc. Biol. Soc. Wash., 
xxii, 1907, 74, under Myrmeciza berlepschi. 
© Myrmeciza berlepschi Ridgway, Proc. Biol. Soc. Wash., xii, April 17, 1909, 74 
(Chimbo, n. w. Ecuadér; coll. U.S. Nat. Mus.). This form (of which I have not seen 
Colombian specimens) may prove to be only subspecifically distinct from M. zeledoni. 
