622 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



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

 "marked with specks of a brownish color." « 



Ran<j>\ — Tropical portions of Mexico and southward to southern 

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



KEV TO THE SPECIES AND SUBSPECIES OF THRYOPHILUS. 



a. Pileum ])lack. 



/>. Under i)arts tawny or chestnut. ( Thryophilus castaneus. ) 

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



of Panama, north toChiriqui. ) Thryophilus castaneus castaneus (p. (524) 



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

 (Eastern Costa Rica and Nicaragua.) 



Thryophilus castaneus costaricensis (p. 625) 



bh. Under parts white, barred with black or dusky. {Tliri/ophilns iiigrlcapill.Ks.) 



c. 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) & 



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



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



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



tin. Pileum not black. 



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

 Avith back; under parts white, narrowly and regularly bai-red with black. 

 (Isthmus of Panama to southwestern Costa Rica.) 



Thryophilus semibadius (p. 627) 



hb. Pileum not bright chestnut (if approaching chestnut not mai-gined 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 thoracicus (p. 628) 



cc. Throat and chest neither striped nor uniform sooty. 



(/. Sides and flanks broadly barred with blackish. ( Tliryophilus pleuroslictus. ) 

 ('. 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. 



b Thryothorus nigricapillus Sclater, Proc. Zool. Soc. Lond., 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, Colombia) .—[Troglodytes'] nigricapiUus 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. 



