Q 
BIRDS OF NORTH AND MIDDLE AMERICA, 165 
dd. Back., etc., deep chestnut-brown or vandyke brown; chest clear chestnut. 
(Costa Rica and western Panam4)......-. Sclerurus canigularis (p. 166). 
bb. Chin and throat bright russet or rufous-tawny, like chest. (Sclerwrus mexicanus.) 
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). 
ce. 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 Panamé 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).¢ 
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 brownish white or very 
pale brownish. (Upper Amazon Valley.) 
Sclerurus fuscus (extralimital).b 
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. 
f. General color deep chocolate brown; smaller (wing 83 8-86.4, tail 53.3- 
58.4). (Colombia.)............--- Sclerurus brunneus (extralimital).c 
Jf. 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 Panam4é; western Ecuadér?). 
Sclerurus guatemalensis (p. 169). 
ec. General color olivaceous. (Western Peru.) 
Sclerurus olivascens (extralimital).¢ 
« Thamnophilus caudacutus Vieillot, Nouv. Dict. 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 (Capim R., lower 
Amazon Valley); Ridgway, Proc. U. 8. 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. 8. Nat. Mus., xii, 1889, no. 762 (pub. Feb. 5, 1890), 28 (monogr.). 
¢ Sclerurus brunneus Sclater, Proc. Zool. Soc. Lond., 1857, 17 (Bogoté, Colombia; 
coll. P. L. Sclater); Cat. Birds Brit. Mus., xv, 1890, 116; Ridgway, Proc. U. 8. Nat. 
Mus., xii, 1889 (1890), 29 (monogr.).—Sclerurus caudacutus brunneus Hellmayr, Novit. 
Zool., xiv, 1907, 56, 58 (Teffé, Brazil; crit.; geog. range). 
@ Sclerurus lawrencet 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.). 
€ Sclerurus olivascens Cabanis, Journ. fir Orn., Jan., 1873, 67 (Monterico, w. Peru); 
Ridgway, Proc. U. 8. Nat. Mus., xii, 1889 (1890), 31 (monogr.). 
