132 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
ANOPLOPS BICOLOR (Lawrence). 
BICOLORED ANTBIRD. 
Adults (sexes alike)—Above plain chestnut-brown or vandyke 
brown, the forehead, lores, and sides of occiput slate color or slate- 
gray, the hindneck partly the same color; malar, suborbital, and 
auricular regions black; sides of neck and thence to flanks (broadly) 
lighter brown (prouts brown to nearly sepia), sometimes with indis- 
tinct dusky spots or streaks along outer edge, especially on sides of neck; 
chin, throat, chest, breast, and abdomen immaculate white; under 
tail-coverts brown (like flanks), tipped or margined with whitish or 
buffy; maxilla blackish, paler (sometimes dull whitish in dried skins) 
terminally and along tomium; mandible dull whitish or pale dull 
yellowish (in dried skins), darker basally; legs and feet horn color 
(in dried skins). 
Adult male.—Length (skins), 136-139 (138) ; wing, 74.5-79.5 (76.8); 
tail, 45.5-52 (47.8); culmen, 18.5-20.5 (19.5); tarsus, 27-28.5 (27.7); 
middle toe, 17.5-19 (18.2).¢ 
Adult female—tLength (skins), 125-126 (125.5);> wing, 73-74 
(73.5) ;® tail, 47-47.5 (47.2);% culmen, 18.5;° tarsus, 26.5;¢ middle 
toe, 17.¢ 
Panamé (Lion Hill; Chepo; Paraiso; Panama; Cascajal, Coclé; 
Santa Fé de Verégua). 
Pithys leucaspis (not Myrmeciza leucaspis Sclater) Lawrence, Ann. Lyc.N. Y., 
vii, 1862, 326 (Lion Hill, Panam4). 
Pithys bicolor Lawrence, Ann. Lyc. Nat. Hist. N. Y., vii, 1862, 484 (Lion Hill 
Station, Panam4 Railway; coll. G. N. Lawrence); viii, 1867, 6 (Lion Hill).— 
ScraTer and Satvin, Proc. Zool. Soc. Lond., 1864, 357 (Lion Hill).—Satvin, 
Proc. Zool. Soc. Lond., 1867, 145 (Santa Fé de Verdgua, Panam4).—SciaTer, 
Cat. Birds Brit. Mus., xv, 1890, 296, part (Panam4, Chepo, and Santa Fe de 
Ver4gua, Panam4). 
[Pithys] bicolor SctaTER and Satvin, Nom. Av. Neotr., 1873, 74, part (Panam). 
Gymnopithys bicolor Savin and Gopman, Biol. Centr.-Am., Aves, ii, 1892, 221 
(Santa Fé de Verdgua, Lion Hill Station, Paraiso Station, and Chepo, Panam). 
[Gymnopithys] bicolor Sharpe, Hand-list, iii, 1901, 30, part (Panam4). 
ANOPLOPS OLIVASCENS (Ridgway). 
OLIVE-SIDED ANTBIRD. 
Similar to A. bicolor, but pileum and hindneck wholly chestnut- 
brown; like rest of upper parts. 
Adults (sexes alike).—Above plain chestnut-brown (prouts brown to 
vandyke brown or even nearly burnt-umber), including entire pileum 
and hindneck; narrowline immediately above bare orbital region, sub- 
orbital region, auricular region, and malar region black; sides of neck 
and thence (broadly) to flanks plain brown (varying from olive-brown 
« Three specimens, b Two specimens, ¢ One specimen, 
