378 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult female. — Similar to the adult male, but ])ileum dusky slate 

 color, sometimes black or nearly so on forehead; length (one skin), 

 68.5; \\ang, 33.5; tail, 14.5-15.5 (15); exposed culmen, 10-10.5 

 (10.2); tarsus, 13; middle toe, 7. "^ 



Eastern Costa Rica (Talamanca; Angostura; Jimenez); north- 

 western Ecuador (San Javier) ? ^ 



Todirostrum ecaudatum (not of D'Orbigny and Lafresnaye) Lawrence, Ann. Lye. 



N. Y., ix, 1868, 110 (Angostura, Costa Rica). — Frantzius, Journ. fiir Orn., 



1869, 307 (Costa Rica). 

 [Orchilus] ecaudatus Sclater and Salvin, Nom. Av. Neotr., 1873, 45, part (Costa 



Rica). 

 Orchilus atricapilhis Lawrence, Ibis, July, 1875, 385 ("Volcan de Irazu," i. e., 



Talamanca, Costa Rica; coll. U. S. Nat. Mus.). — Sclater, Cat. Birds Brit. 



Mus., xiv, 1888, 89. — Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1888, 



17. — Hartert, Novit. Zool., ix, 1902, 607 (San Javier, n. w. Ecuador; crit.; 



descr.). 

 [Orchilus] atricapillus Sharpe, Hand-list, iii, 1901, 108. 

 Perissotriccus atricapUhis Oberholser, Proc. U. S. Nat. Mus., xxv, no. 1276, Aug. 



30, 1902, 64. 



Genus PLACOSTOMUS Ridgway. 



Placostovnis <• Ridgway, Proc. Biol. Soc. Wash., xviii, Sept. 2. 1905, 208. (Type, 

 Platyrhynchits siiperciliaris Lawrence.) 



Similar to Platytriccus, but feathers of chin and frontal antia? with 

 conspicuous bristly tips ; tarsi and toes much more slender, the basal 

 phalanx of middle toe wholly united to inner (as well as outer) toe; 

 outermost (tenth) primary relativel}^ much longer (longer than fifth 

 instead of not longer than second), and tail relatively much smaller 

 (only about two-fifths, instead of about half, as long as wing). 



Bill very broad and flat, its width at nostrils equal to distance from 

 nostril to ti]) of maxilla, its lateral outlines slightly convex, especially 

 subterminally ; exposed culmen about half as long as head, straight 

 to near tip where rather abruptly decurved, the tip of maxilla mi- 

 nutely uncinate; gonys straight, about as long as mandibular rami. 

 Nostril exposed, ovoid, in anterior end of nasal fossge, with rather 

 broad superior membrane. Rictal bristles greatly developed, reach- 

 ing nearly to end of bill ; feathers of chin and frontal antifft with con- 

 spicuous bristly points, those of the latter extending far beyond 

 nostrils. Wing rather long, with longest primaries exceeding seconda- 

 ries by length of exposed culmen, or slightly more; eighth and ninth 

 primaries longest, t^nth (outermost) intermediate between fifth and 

 sixth. Tail very small, only about two-fifths as long as wing, slightly 

 rounded, the rectrices relatively narrow. Tarsus slender, about as 



a Two specimens. 



^According to Hartert, as cited below. 



c ttXcc^, a broad surface; drojiia, mouth. 



