622 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



branches and built of fine grass,"" but the eggs are said to be 

 "marlied with specks of a brownish color."" 



Range. — Tropical portions of Mexico and southward to southern 

 Brazil, Bolivia, and Peru. (Numerous species. ) 



KEY TO THE SPECIES AND SUBSPECIES OP THBYOPHILUS. 



a. Pileum black. 



h. Under parts tawny or chestnut. ( Thryophilus castaneus. ) 

 c. Under parts tawny, distinctly barred with black, at least on sides. (Isthmus 



of Panama, north toOhiriqui. ) Thryophilus castaneus castaneus (p. 624) 



cc. Under parts bright chestnut or rufous-chestnut, indistinctly; if at all barred. 

 (Eastern Costa Eica and Nicaragua.) 



Thryophilus castaneus costaricensis (p. 625) 



lili. Under parts white, barred with black or dusky. ( Thryophilus nigricapillus. ) 



r. Chin and throat immaculate white; bars of under parts narrower, duller 



black, or dusky; back, etc., lighter chestnut or chestnut-rufous. (Western 



Ecuador and Colombia. ) 



Thryophilus nigricapillus nigricapillus (extralimital) 6 



cc. Chin and throat barred with black or dusjiy, the bars of other under parts 



broader, more decidedly black ; back, etc. , darker chestnut. ( Rio Truando, 



northwestern Colombia. ) Thryophilus nigricapillus schottii (p. 626) 



(III. Pileum not blafc. 



b. Pileum bright chestnut (margined laterally and anteriorly with black) concolor 

 with back; under parts white, narrowly and regularly barred with black. 

 (Isthmus of Panama to southwestern Costa Rica. ) 



Thryophilus semibadius (p. 627) 



bh. Pileum not bright chestnut ( if approaching chestnut not margined laterally and 



anteriorly with black, and under parts not barred with black); under parts 



not narrowly and regularly barred with black. 



c. Throat and chest striped with black or dark sooty gray, or (in some young 



examples) uniform sooty brown. (Eastern Nicaragua to Chiriqui and 



Veragua. ) Thryophilus thoraeicus (p. 628) 



cc. Throat and chest neither striped nor uniform sooty. 

 d. Sides and flanks broadly barred with blackish. ( Thryophilus pleurostictus. ) 

 e. Throat and median portion of chest and breast immaculate white. 

 /. Duller brown above, the secondaries more distinctly barred; median 

 under parts more narrowly white; larger (adult male averaging, wing 

 66.1, tail 53.9, exposed culmen 17.8; adult female, wing 61.3, tail 48.9, 

 exposed culmen 16.7). (Southwestern Mexico, in States of Guerrero, 

 Oaxaca, and Chiapas; Guatemala?; Honduras?). "^^ 



Thryophilus pleurostictus pleurostictus (p. 629) 



"Grayson, Mem. Bost. Soc. N. H., ii, 1874, 268. 



i Thryothorus nigricapillus Sclater, Proc. Zool. Soc. Lend., 1860, 84 (Nanegal, w. Ecua- 

 dor; coll. P. L. Sclater). — [^Thryophilus] nigricapillus Sclater and Salvin, Nom. Av. 

 Neotr., 1873, 7. — Thryophilus nigricapillus Sclater and Salvin, Proc. Zool. Soc. Lond., 

 1879, 493 (Antioquia, Colombia); Salvin and Godman, Biol. Centr.-Am., Aves, i, 1880, 

 89, part; Sharpe, Cat. Birds Brit. Mus., vi, 1881, 217, part (Nanegal, w. Ecuador; 

 Santa Elena, CoXomhia) .— [Troglodytes'] nigricapillus Gray, Hand-list, i, 1869,189, 

 no. 2569. 



I have not seen Colombian specimens from the localities cited, and therefore am 

 not sure they are identical in characters with the Ecuadorean bird. 



