54 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



KEY TO THE SPECIES AND SUBSPECIES OF DYSITHAMNUS. 



a. Pileum and hiiidneck at leaet partly slate color or slate-gray. (Adult males.) 

 b. Pileum and hindneck without black or white markings. 

 c. A narrow white spot or streak on lower edge of auricular region. (Southwestern 



Brazil; Bolivia?) Dysithamnus affinis, adult male (extralimital).o 



cc^ No trace of white spot or streak on lower edge of auricular region. (Dysi- 

 thamnus mentalis.) 

 (1. Under parts of body more deeply yellowish, strongly and abruptly con- 

 trasted with grayish white of throat. (Southeastern Brazil; Paraguay.) 

 Dysithamnus mentalis mentalis, adult male (extralimital).^ 

 dd. Under parts of body paler yellowish (sometimes white). 

 e. Abdomen more or less yellowish; back more or less olivaceous, different 

 from color of pileum and hindneck. 

 /. Larger (wing 63.5-66.5). 

 g. Paler. (Tobago.) 



Dysithamnus mentalis oberi, adult male (extralimital).c 

 gg. Darker. (Colombia and Venezuela.) 



Dysithamnus mentalis semicinereus, adult male (extralimital).<^ 

 ff. Smaller (wing 57-62). (Panama to Guatemala.) 



Dysithamnus mentalis septentrionalis, adult male (p. 55). 

 ee. Abdomen white; back slate color, concolor with jjileum and hindneck. 

 /. Lighter and clearer slate color above, more extensively white beneath, 

 the flanks paler and less olive or buffy brownish. (Trinidad.) 



Dysithamnus mentalis andrei, adult male (extralimital).« 



« Dysithamnus affinis Pelzeln, Orn. Bras., ii, Abth., 1869, 80, 149 (Villa Maria, 

 Brazil; coll. Vienna Mus. ).—D[ysithamnus] a[ffinis] affmis Hellmayr, Novit. ZooL, 

 xiii, Feb., 1906, 32, in text (crit.); Dysithamnus affinis affinis Hellmayr, Novit. ZooL, 

 XV, 1908, 69 (Faz. Esperanza, Brazil; crit.). — Dysithamnus olivaeeus (not Thamno- 

 philus olivaeeus Tschudi) Sclater, Cat. Birds Brit. Mus., xv, 1890, 222, excl. syn. 

 part. — Dysithamnus mentalis (not Myothera mentalis Temminck) Allen, Bull. Am. 

 Mus. N. IL, V, 1893, 118, excl. syn. (Chapada, Matto-Grosso, Brazil; crit.). 



b Myothera mentalis Temminck, PL Col., ii, livr. 30, Jan., 1823, text to pi. 179, 

 fig. 3 (Brazil; coll. Vienna Mus.). — Daysthamnus mentalis Burmeister, Syst. Ueb. 

 Th. Bras., iii, 1856, 82.— Dysithamnus mentahs Sclater, Proc. ZooL Soc. Lond., 1858, 

 221, part; Cat. Birds Brit. Mus., xv, 1890, 221; Allen, Bull. Am. Mus. N. IL, ii, 

 1889, 250. — D[ysithamnus] mentalis mentalis Hellmayr, Novit. ZooL, xiii, Feb., 1906, 

 32, in text (crit.).— M[yiothera] poliocephala Maximilian, Beitr. Naturg. Bras., iii, 

 pt. ii, 1831, 1098 (a. e. Brazil; type now in coll. Am. Mus. Nat. Hist.) 



c Dysithamnus mentalis oberi Ridgway, Proc. Biol. Soc. Wash., xxi, Oct. 20, 1908, 

 193 (Tobago; coll. U. S. Nat. Mus.). 



d Dysithamnus semicinereus Sclater, Proc. ZooL Soc. Lond., 1855, 90, 147, pi. 97 

 (Bogotd, Colombia; coll. P. L. Sclater); Cat. Birds Brit. Mus., xv, 1890, 221, part.— 

 D[ysithamnus] mentalis semicinereus Ridgway, Proc. Biol. Soc. Wash., xxi, Oct. 20, 

 1908, 193, in text. 



« Dysithamnus affinis andrei Hellmayr, Novit. ZooL, xiii, Feb., 1906, 31 (Caparo, 

 Triniddd; coll. Tring Mus.). — Dysithamnus mentalis spodionotiis (not D. spodionotm 

 Salvin and Godman) Chapman, Bull. Am. Mus., N. H., vi, 1894, 50 (Triniddd). 



