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Rh (Cobán, Guatemala; Belize); Proc. Zool. Soc. Lond., 1870, 837 (San Pedro, Honduras). — and, Ibis, 1860, 36 (Yzabál, Guatemala). —, Proc. Zool. Soc. Lond., 1867, 145 (Santa Fé de Verágua, w. Panamá); 1870, 195 (Mina de Chorcрa and Bugaba, w. Panamá). —, Ann. Lyc. N. Y., ix, 1868, 109 (Angostura, Costa Rica). —, Journ. für Orn., 1869, 305 (Costa Rica). —, Proc. Zool. Soc. Lond., 1878, 61 (San Carlos, Costa Rica); Ann. Soc. Linn. Lyon, 1878, 39 (Guatemala). —, Proc. U. S. Nat. Mus., vi, 1883, 386 (Sucuyá, Nicaragua), 405 (Los Sábalos, Nicaragua). —, Anal. Mus. Nac. Costa Rica, i, 1887, 115 (Pacuare, Jiménez, and Pozo Azúl, Costa Rica). — and, Biol. Centr.-Am., Aves, ii, 1892, 214, part (Playa Vicente and Sochiapa, Vera Cruz; Belize, Brit. Honduras; Chiséc, etc., Guatemala; San Pedro, Honduras; Matagalpa, etc., Nicaragua; Tucurríqui, etc., Costa Rica; Bugaba, Mina de Chorcha, and Santa Fé de Verágua, Panamá). —, Proc. U. S. Nat. Mus., xvi, 1893, 501 (Rio Escondido, Nicaragua; habits). —, Expl. Zool. Merid. Costa Rica, 1893, 42 (Lagarto, Boruca, Térraba, and Buenos Aires, s. w. Costa Rica). —, Ibis, 1896, 440 (Volcan de Miravalles, Costa Rica).
 * [Cercomacra] tyrannina and, Nom. Av. Neotr., 1873, 73, part. — , Hand-list, iii, 1901, 28, part.
 * Cercomacra tyrannina tyrannina, Ann. Carnegie Mus., v, no. 1, Oct. 1, 1908, 9, in text (s. w. Costa Rica).
 * Cercomacra crepera, Auk, xviii, Oct., 1901, 365 (Divala, Chiriquí, Panamá; coll. E. A. and 0. Bangs). — , Pub. 125, Field Mus. Nat. Hist., 1907, 109 (Los Amates, e. Guatemala; crit.).
 * Cercomacra tyrannina crepera, Auk, xxiv, 1907, 296 (Boruca, Paso Reál, Pozo del Rio Grande, and Barranca, s. w. Costa Rica). — , Ann. Carnegie Mus., v, 1908, 8 (e. Costa Rica; crit.); vi, 1910, 612 (Costa Rica; crit.; habits). — , Pub. 146, Field Mus. N. H., orn. ser., i, no. 6, 1910, 271 (Guayabo, Costa Rica).

 Genus GYMNOCICHLA Sclater.

Medium-sized Formicariidæ (length about 140-160 mm.) resembling the larger and stouter species of Myrmeciza, but with bill weaker, less compressed anteriorly and less strongly uncinate, the culmen less distinctly ridged; nostril smaller; relatively shorter tarsus (only two-fifths as long as wing), with acrotarsium distinctly scutellate; tail shorter (not more than four-fifths as long as wing), the adult males with loral and suborbital regions (sometimes whole pileum) naked.

Bill about as long as head, narrowly wedge-shaped in vertical profile (with nearly straight lateral outlines), its width at posterior end of nostrils about equal to its depth at same point and equal to a little less than half the distance from nostril to tip of maxilla; culmen slightly ridged, straight to near tip where abruptly decurved, the point of maxilla slightly or minutely uncinate; tomium straight, with small subterminal notch, that of the mandible less distinct; gonys  81255° — Bull. 50—11——7