126 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
Formicarius rufipectus ¢ Satvin, Proc. Zool. Soc. Lond., 1866, 73, pl. 8 (San- 
tiago de Verdgua, Panamé; coll. Salvin and Godman); 1867, 145 (Santiago de 
VerA4gua; habits).—Sciater, Cat. Birds Brit. Mus., xv, 1890, 306, part (Verd4- 
gua, Panam4).—Satvin and Gopman, Biol. Centr.-Am., Aves, ii, 1892, 235, 
part (Santiago de VerAgua).—Rmmeway, Proc. U. 8. Nat. Mus., xvi, 1893, 685 
part (Santiago de Verdgua; monogr.).—Banes, Proc. Biol. Soc. Wash., xxi, 
1908, 157 ([San Antonio], n. w. Colombia).—CaRriker, Ann. iia aac Mus, es 
vi, 1910, 625 (Juan Vifias, e. Costa Rica; crit.). 
Biormicartus| rufipectus Satvin, Proc. Zool. Soc. Lond., 1866, 74. 
[Formicarius] rufipectus SctateR and Satvin, Nom. Av. Neotr., 1873, 75.— 
Suarpe, Hand-list, iii, 1901, 39, part (Panama). 
Formicarius castaneiceps CARRIKER, Ann. Carnegie Mus., iv, April 1, 1908, 301 
(Juan Vifias, Costa Rica; coll. Carnegie Mus.). 
Genus HYLOPHYLAX Ridgway. 
Hylophylax b Ripcway, Proc. Biol. Soc. Wash., xxii, Apr. 17, 1909, 70. (Type, 
Conopophaga nzxvioides Lafresnaye.) 
Small Formicariide (length about 100 mm.) with second phalanx 
of middle toe partly united to outer toe, outstretched feet reaching to 
beyond tip of tail, tail not more than three-fifths as long as wing, 
planta tarsi fused (nonscutellate) and acrotarsium indistinctly 
scutellate. 
Bill shorter than head (sometimes nearly as long), rather stout, 
rather broad and depressed basally, with straight or (in part) even 
slightly convex lateral outlines, its width at frontal antize much 
greater (sometimes twice as great) as its height at same point and 
equal to from a little less than half to a little more than two-thirds 
the distance from nostril to tip of maxilla; culmen distinctly ridged, 
nearly straight basally (sometimes for most of its length), gradually 
to rather abruptly decurved terminally, the tip of maxilla slightly 
but distinctly uncinate; maxillary tomium straight or slightly con- 
cave, minutely but distinctly notched subterminally; mandibular 
tomium straight or faintly convex, minutely notched subterminally, 
the tip of mandible forming a short, more or less recurved, point; 
gonys more or less strongly convex and prominent basally, more 
gently convex and more or less decidedly ascending terminally. Nos- 
tril exposed, more or less widely separated from feathering of latero- 
frontal antiz (nearly in contact with the latter in H. nevioides), 
longitudinally ovate, more or less pointed anteriorly, margined above 
@ The following citations of F. rufipectus refer to a different form: 
Formicarius rufipectus (not of Salvin) Sclater, Cat. Birds Brit. Mus., xv, 1890, 
306, part (Baisa, wéEcuadér).—Salvin and Godman, Biol. Centr.-Am., Aves, 
ii, 1892, 235 (Baisa, w. Ecuadér).—Salvadori and Festa, Boll. Mus. Zool., 
etc., Torino, xv, 1899, no. 362, 33 (Gualea, w. Ecuadér).—Menegaux and 
Hellmayr, Bull. Soc. Philom., 1906, 52 (Esmeraldas, Pachij4l, and Oyacachi, 
w. Ecuadé6r; crit.). 
b°Y' Ay, a wood, forest; #éAaé, a watcher, guard, sentinel. 
