BIRDS OF NORTH AND MIDDLE AMERICA. 165 



dd. Back., etc., deep chestnut-brown or vandyke brown; chest clear chestnut. 



(Costa Rica and western PanamA) Sclerurus canigularis (p. 166). 



hh. Chin and throat bright russet or rufous-tawny, like chest. {Sclerurus viexicanus.) 

 c. Coloration lighter, the back, etc., warm-sepia brown, the lower rump and upper 

 tail-coverts chestnut. (Southeastern Mexico to Amazon Valley.) 



Sclerurus mexicanus mexicanus (p. 166). 

 cc. Coloration darker, the back, etc., dark sepia brown, the lower rump and 

 upper tail-coverts deep vandyke to deep chocolate or walnut brown. 

 (Caribbean slope of western Panama and eastern Costa Rica.) 



Sclerurus mexicanus pullus (p. 168). 

 aa. Lower rump and upper tail-coverts similar in color to back or but slightly more 

 rufescent. 

 b. Chin and throat tawny or russet, like chest. (Guiana and lower Amazon Valley.) 



Sclerurus caudacutus (extralimital).a 

 bb. Chin and upper throat with basal portion of feathers whitish or very pale 

 brownish, the tip or terminal margin dark brown or dusky. 

 c. General color umber or sepia brown. 



d. Throat brown, with basal portion of feathers dull browaiish white or very 

 pale brownish. (Upper Amazon Valley.) 



Sclerurus fuscus (extralimital).* 



dd. Chin and upper throat white, the feathers tipped or margined with brown 



or dusky. 



e. Chest without spots or distinct streaks of tawny, and general coloration 



lighter brown. 



/. General color deep chocolate brown; smaller (wing 83 8-86.4, tail 53.3- 



58.4). (Colombia.) Sclerurus brunneus (extralimital).c 



ff. General color vandyke brown, more olive-brown on under parts, the 

 sides of head and neck and upper chest brownish tawny; larger 

 (wing 100.3, tail 78.7). (Southeastern Brazil.) 



Sclerurus lawrencei (extralimital).<^ 

 ee. Chest with distinct streaks or spots of tawny, and general color much 

 darker brown. (Southern Mexico to Panama; western Ecuad6r?). 



Sclerurus guatemalensis (p. 169). 

 cc. General color olivaceous. (Western Peru.) 



Sclerurus olivascens (extralimital).« 



« Thamnophilus caudacutus Vieillot, Nouv. Diet. d'Hist. Nat., iii, 1816, 310 

 (Cayenne). — [Sclerurus] caudacutus Bonaparte, Consp. Av., i, 1850, 210. — Sclerurus 

 caudacutus Sclater and Salvin, Proc. Zool. Soc. Lond., 1867, 573 (Capini R., lower 

 Amazon Valley); Ridgway, Proc. U. S. Nat. Mus., xii, 1889 (1890), 27 (monogr.); 

 Sclater, Cat. Birds Brit. Mus., xv, 1890, 116. — Sclerurus caudacutus caudacutus Hell- 

 mayr, Novit. Zool., xiv, 1907, 56 (crit.). 



b T[inactor] fuscus Maximilian, Beitr. Naturg. Bras., iii, 1831, 1106, part (male; 

 locality not stated; type now in coll. Am. Mus. Nat. Hist.). — Sclerurus fuscus Ridg- 

 way, Proc. U. S. Nat. Mus., xii, 1889, no. 762 (pub. Feb. 5, 1890), 28 (monogr.). 



c Sclerurus brunneus Sclater, Proc. Zool. Soc. Lond., 1857, 17 (Bogota, Colombia; 

 coll. P. L. Sclater); Cat. Birds Brit. Mus., xv, 1890, 116; Ridgway, Proc. U. S. Nat. 

 Mus., xii, 1889 (1890), 29 (monogr.). — Sclerurus caudacutus brunneus Hellmayr, Novit. 

 Zool., xiv, 1907, 56, 58 (Teffe, Brazil; crit.; geog. range). 



d Sclerurus lawrencei Ridgway, Proc. U. S. Nat. Mus., xii, 1889, no. 762 (pub. 

 Feb. 5, 1890), 29 ("Bahia" [Brazil], but locality probably erroneous; coll. Am. 

 Mus. Nat. Hist.). 



e Sclerurus olivascens Cabanis, Jouni. fiir Om., Jan., 1873, 67 (Monterico, w. Peru); 

 Ridgway, Proc. U. S. Nat. Mus., xii, 1889 (1890), 31 (monogr.>. 



