( 339 ) 
of the head, but the back is darker rufescent; brown, and wings and tail are 
more like 7. x. huberi, though the coloration of these parts is rather variable, 
Wing 75—80 ; tail 58—63 mm. 
Obs. Specimens from the Orinoco (fourteen examined) agree perfectly with the 
typical series in the Vienna Museum. 
(d) T. nigrocinereus tschudii Pelz. 
Thamnophilus tschudii Pelzeln, I.c. pp. 76, 141 (1868.—Borba, Rio Madeira) ; Sclater, Cat. Birds 
Brit, Mus, xv. p. 191 (Borba ; Iquitos, N. Peru). 
Hab. North Brazil: Borba, Rio Madeira (Natterer). North Peru: Iquitos 
(H. Whitely), Nauta (Hauxwell). 
3 ad. Differs from all the preceding races by having the whole back from the 
forehead to the ramp uniform black. White dorsal patch, wings and tail as in its 
allies. The coloration of the under parts is rather variable, as shown by a series 
from Borba in the Vienna Museum. Two have the throat only black, the rest of 
the belly slate-grey, exactly as in 7. . nigrocinereus, though the abdomen is slightly 
darker ; in two others throat and foreneck are black, breast and abdomen sooty 
blackish, while the fifth specimen has all the lower surface uniform deep black. 
Wing 79—82 ; tail 62—65 mm. 
? ad. Cap deep sooty black as in 7. x. huberi, but the sides of the head and 
the throat are sooty blackish, the breast and abdomen dark rufous brown, wings 
and tail considerably darker, and the back is chestnut-brown. 
Wing 75—77 ; tail 59—60 mm. 
Obs. An adult male from Nauta (Hauxwell coll., September 9, 1880; Mus. 
H. v. Berlepsch) agrees well with those from Borba. ] 
(202. Thamnophilus aethiops polionotus Pelz. 
Cf, Nov, Zool. xiv. 1907. p. 369 (Humaytha). 
Left bank of the Rio Madeira: Humaytha (Hoffmanns). | 
203. Thamnophilus aethiops punctuliger Pelz. 
[Thamnophilus aethiops Sclater, Proc. Zool. Soc. Lond. xxvi, 1858, p. 65 (1858.—-Rio Napo, Eastern 
Ecuador). | 
T. punctuliger Pelzeln, Zur Orn. Bras. ii. p. 146 (1868,—Borba, Rio Madeira). 
No. 346. 3 ad., Calama, 7. viii. 1907.—Wing 76; tail 61; bill 19 mm. 
Nos. 106, 289, 333, 455. $9, Calama, 25. vi., 29. vii., 5, 26. viii. 1907.— Wing 
72—76 ; tail 56—61; bill 18—19 mm. 
No. 792. ? ad., Allianca, 19. xi. 1907.—Wing 75 ; tail 58 ; bill 19 mm. 
No. 964, @ ad., Marnins, 30. vi. 1908.—Wing 73} ; tail 59; bill 18 mm. 
The adult male is identical with Pelzeln’s type in the Vienna Museum. Both 
have a distinct, concealed, white interscapular patch, and the lesser and median 
upper wing-coverts conspicuously tipped with white, while those of the greater series 
are either uniform dusky or show but slight traces of apical spots. 
The females, the first on record, are very similar to those of 7. a. polionotus, 
but the sides of the head as well as the throat are rather lighter ferraginous, and 
the belly is somewhat paler. Some come very near 7. a. tncertus, while the 
one from Marnuins, the darkest of all, is scarcely distinguishable from polionotus. 
T. aethiops, T. juruanus, T. polionotus, T. punctuliger, and 7’. incertus are 
