1887.] 387 [Ridgway. 



13. Thryothorus ruficeps (MS. only ?). Type, No. 2659, 

 Brazil. 



This is T. felix Scl., and is therefore probably from Mexico. In 

 the color of the sides and flanks, this specimen agrees exactly with 

 Professor Baird's description (cf. Review, p. 136) of a specimen 

 from Oaxaca in Mr. Salvin's collection, the color being "a shade 

 of brownish, paler than the back," and also with the colored figure 

 in the Biologia Centralis Americana (Aves, pi. vn, 1). Four Ma- 

 zatlan specimens in the National Museum collection, however, 

 have the sides and flanks a deep and decided buff, totally different 

 from the color of the back. Were this difference in the color of 

 the sides and flanks constant, the birds from Mazatlan would be very 

 readily separable from those from Oaxaca ; but that the latter vary 

 in this respect would appear from the fact that Dr. Sclater's origi- 

 nal description (cf. P. Z. S., 1859, 371) of the species describes 

 the color of the under parts as being "cinnamomeo-rhfescens, ventre 

 medio pallidiore, gutture albo" while Mr. Sharpe (Cat. B. Br. Mus., 

 vi, p. 232) says, " sides of the body and thighs fawn-buff." 



14. Thryothorus fasciato-ventris (Rev. Zool., 1845, 337). 

 Type, No. 2658, " Bogota." 



This specimen differs from Mr. Sharpe's description (cf. Cat. B. 

 Br. Mus., vi, pp. 229, 230) in having the entire breast barred with 

 whitish, there being no uniform black band as described or as shown 

 in the colored figure on plate 14 (fig. 1). In fact, both the latter 

 and the description agree essentially with a specimen from the 

 Isthmus of Panama in the National Museum collection (No. 53897, 

 $ , McLeannan), which again differs from an adult male from Santa 

 Marta (No. 34095, Nat. Mus.,) only in having the dusky (not 

 "grayish black") of the ear-coverts and the uniform black of the 

 breast rather more extended, the thighs more distinctly barred with 

 black, and the under tail-coverts more narrowly barred with white 

 the whitish bars on the sides, flanks, and abdomen being also rather 

 less distinct. According to Mr. Sharpe's views (/. c), the Pana- 

 ma bird should be T. albigularis Scl. (Cyphorinus albigularis Scl. 

 P. Z. S., 1855, 76, pi. 88), but the original description of the lat- 

 ter makes no mention of uniform black on the breast, while the 

 colored plate shows distinct white bands over the whole breast as 

 well as the more posterior lower parts, these white bars beino- at 

 the same time altogether broader than in any example of the species 

 (in its comprehensive sense) that has come under my notice. In 

 other words, there is far greater resemblance between the Panama 



