Southwestern Costa Rica (Pozo del Rio Grande, Paso Reál, Lagarto, Boruca, and Barranca, Boruca; Buenos Aires; El Generál; Pozo del Pitál, Rio Naranjo; Pozo de Térraba; Pozo Azúl de Pirrís; Las Trojas) and western Panamá (Divala; Bugaba; Chiriquí).
- Myrmornis hoffmanni Cabanis, Journ. für Orn., Mar., 1861, 95 (Costa Rica; coll. Berlin Mus.).
- Formicarius hoffmanni Lawrence, Ann. Lyc. N. Y., ix, 1868, 110 (Costa Rica). — Frantzius, Journ. für Orn., 1869, 306 (Costa Rica). — Salvin, Proc. Zool. Soc. Lond., 1866, 75, part (Costa Rica); 1870, 195 (Bugaba, Panamá). — Zeledón, Anal. Mus. Nac. Costa Rica, i, 1878, 115, part (Las Trojas and Pozo Azúl de Pirrís, Costa Rica). — Sclater, Cat. Birds Brit. Mus., xv, 1890, 304, part (Bugaba, Verágua, and Chiriquí, Panamá). — Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1892, 234, part (Las Trojas, Costa Rica; Chiriquí and Bugaba, Panamá). — Carriker, Ann. Carnegie Mus., vi, 1910, 623 (s. w. Costa Rica, up to 1,500 ft.; crit.; habits).
- [Formicarius] hoffmanni Sclater and Salvin, Nom. Av. Neotr., 1873, 75, part (Costa Rica). — Sharpe, Hand-list, iii, 1901, 39, part (s. "w. Costa Rica).
- Formicarius hoffmanni hoffmanni Bangs, Auk, xxiv, July, 1907, 298 (Boruca, Paso Reál, Pozo del Rio Grande, Lagarto, and Barranca, s. w. Costa Rica; crit.).
- F[ormicarius] moniliger hoffmanni Ridgway, Proc. Biol. Soc. Wash., xxi, Oct. 20, 1908, 195, in text.
- Formicarius umbrosus (not of Ridgway) Bangs, Auk, xviii, 1901, 366 (Divala, Panamá).
FORMICARIUS MONILIGER PANAMENSIS Ridgway.
PANAMA ANTTHRUSH.
Similar to F. m. hoffmanni but averaging smaller, and coloration much lighter, the under parts more strongly suffused with olive and buffy, and color of under tail-coverts lighter, more tawny; black gular area more frequently (?) bordered posteriorly with a more or less distinct collar of deep vinaceous-cinnamon or dull cinnamon- rufous, or indication of one.
Adult male. — Length (skins), 153-172 (162); wing, 86-88 (87); tail, 50-55 (52.4); culmen, 20.5-21.5 (20.7); tarsus, 30-32 (30.9); middle toe, 18-19.5 (18.9).[1]
Adult female. — Length (skins), 144-161 (154); wing, 84-88.5 (86.9); tail, 48-51.5 (49.7); culmen, 18.5-20.5 (19.9); tarsus, 30-32 (31); middle toe, 17-20 (18).[1]
Eastern Panamá (Lion Hill, Obispo, and Paraiso stations, Panamá railway; Chepo; Laguna del Pita; Cascajál, Coclé); Colombia (Remédios, Antioquía)?
- Formicarius analis (not Myothera analis Lafresnaye) Lawrence, Ann. Lyc. N. Y., vii, 1862, 326 (Lion Hill station, Panamá).
- Formicarius hoffmanni (not Myrmornis hoffmanni Cabanis) Sclater and Salvin, Proc. Zool. Soc. Lond., 1864, 857 (Lion Hill, Panamá);(?) 1879, 526 (Remédios,
