BIRDS OF NORTH AND MIDDLE AMERICA. 97 
(Cobén, Guatemala; Belize); Proc. Zool. Soc. Lond., 1870, 837 (San Pedro, 
Honduras).—Satvin and Scrarer, Ibis, 1860, 36 (Yzab4l, Guatemala),— 
Satvin, Proc. Zool. Soc. Lond., 1867, 145 (Santa Fé de Vcrégua, w. Panamé4); 
1870, 195 (Mina de Chorcha and Bugaba, w. Panam4).—Lawrencr, Ann. 
Lyc. N. Y., ix, 1868, 109 (Angostura, Costa Rica).—Franrzius, Journ. 
fiir Orn., 1869, 305 (Costa Rica).—Bovucarp, Proc. Zool. Soc. Lond., 1878, 
61 (San Carlos, Costa Rica); Ann. Soc. Linn. Lyon, 1878, 39 (Guatemala).— 
Nurtine, Proc. U. 8. Nat. Mus., vi, 1883, 386 (Sucuy4, Nicaragua), 405 
(Los Sdbalos, Nicaragua). —ZELEp6N, Anal. Mus. Nac. Costa Rica, i, 1887, 
115 (Pacuare, Jiménez, and Pozo Aztl, Costa Rica).—Sa.vin and Gopman, 
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; Tucurriqui, etc., Costa Rica; Bugaba, 
Mina de Chorcha, and Santa Fé de Verdgua, Panama).—Ricumonp, Proc. 
U. S. Nat. Mus., xvi, 1893, 501 (Rio Escondido, Nicaragua; habits).— 
Cuernig, Expl. Zool. Merid. Costa Rica, 1893, 42 (Lagarto, Boruca, Térraba, 
and Buenos Aires, s. w. Costa Rica).—UnpbErwoop, Ibis, 1896, 440 (Volcan 
de Miravalles, Costa Rica). 
[Cercomacra] tyrannina ScuatTEeR and Sauvin, Nom. Av. Neotr., 1873, 73, part.— 
SHarpe, Hand-list, iii, 1901, 28, part. 
Cercomacra tyrannina tyrannina CaRRIKER, Ann. Carnegie Mus., v, no. 1, Oct. 
1, 1908, 9, in text (s. w. Costa Rica). 
Cercomacra crepera Bangs, Auk, xviii, Oct., 1901, 365 (Divala, Chiriqui, Panam4; 
coll. E. A. and O. Bangs).—Drarzsorn, Pub. 125, Field Mus. Nat. Hist., 
1907, 109 (Los Amates, e. Guatemala; crit.). 
Cercomacra tyrannina crepera BaNes, Auk, xxiv, 1907, 296 (Boruca, Paso Real, 
Pozo del Rio Grande, and Barranca, s. w. Costa Rica).—CarRIkER, Ann. 
Carnegie Mus., v, 1908, 8 (e. Costa Rica; crit.); vi, 1910, 612 (Costa Rica; 
crit.; habits)—Frrry, Pub. 146, Field Mus. N. H., orn. ser., i, no. 6, 1910, 
271 (Guayabo, Costa Rica). 
Genus GYMNOCICHLA Sclater. 
Gymnocichla ScraTER, Proc. Zool. Soc. Lond., 1858, 274. (Type, Myiothera 
nudiceps Cassin.) 
Medium-sized Formicariide (length about 140-160 mm.) resem- 
bling 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 scutel- 
late; 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. 5|0—11——7 
