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sometimes with a narrow, rusty buff apical margin. Lores, cheeks, and ear-coverts 
dull dark slate-grey. Lower parts clear ferruginous, throat palest, foreneck and 
breast darkest, flanks tinged with brownish. 
Wing 77—80 ; tail 60—64 mm. 
Obs. Miss Snethlage (Jc. pp. 283-4) records both 7. nigrocinereus and 
T. cinereoniger from Marajé (S. Natal) and Monte Alegre, under the erroneous — 
supposition that the specimens without the white mark on the outer web of the 
external rectrix represent the former “species.” At my request, the learned lady 
sent me some of these examples. I found that the presence or absence of the 
white spot was a purely individual character, and that all skins from Lower 
Amazonia (except those obtained on the Tapajéz) were unquestionably referable to 
nigrocinereus, having the head all round, foreneck and mantle black, ete. 
(6) T. nigrocinereus: huberi Snethlage. 
Thamnophilus huberi Snethlage, Orn. Monber. xv. p. 161 (1907.—Ilha de Goyana, Rio Tapajéz) ; 
eadem, Journ. f. Orn. 1908. p. 509 (Goyana). ; 
T. cinereoniger (nec Pelzeln) Pelzeln, Zur Orn, Bras. ii. 1868. p. 76 (part. : Tapajéz). 
T. nigrocinereus (nec Sclater) Chapman & Riker, Auk 1891. p. 28 (Santarem). 
Hab. Lower Amazonia, Rio Tapajéz: Santarem (Natterer, Smith), Ilha de 
Goyana (Snethlage). 
g ad. Agrees with the preceding form in having the top and sides of the head 
as well as the mantle black, the latter conspicuously contrasted with the slate-grey 
of the ramp, but the throat is slate-grey like the rest of the under surface, and the 
under tail-coverts are broadly tipped with white. 
Type: wing 82 ; tail 67 mm. 
? ad. Differs from T. n. nigrocinereus by its darker, deep sooty black, slightly 
glossy pileum, deeper grey sides of the head, and by having the edges to the upper 
wing-coverts, remiges, and rectrices much darker rafous brown. 
Wing 784—80 ; tail 62—64 mm. 
Obs, The female type of 7. hubert is considerably darker cinnamon-rufous 
below than either T. ». nigrocinereus or T. n. cinereoniger, but a second specimen 
from the Tapajéz (coll. Natterer) does not differ in that respect from its allies. 
Otherwise it is practically identical with the Goyana female. I am greatly indebted 
to Miss Snethlage for the loan of the typical examples. 
(c) 1. nigrocinereus cinereoniger Pelz. 
Thamnophilus cinereoniger Pelzeln, Zur Orn. Bras. ii. pp. 76, 143 (1868.—near Airaéo, Marabitanas, 
Rio Vaupé, R. Amajad : Rio Negro); Berlepsch & Hartert, Nov. Zool. ix. 1902, p. 69 
(Munduapo, Maipures, Altagracia ; Upper Orinoco, Venezuela). 
Hab. N.W. Brazil, Rio Negro district: Airio, Marabitanas, Rio Vaupé, 
Rio Amajai (Natterer). Venezuela, Upper Orinoco: Munduapo, Maipures, 
Altagracia (Cherrie). 
3 ad. Differs from the preceding races by having the cap decidedly daller 
blackish ; the mantle mainly sooty grey, clouded with dusky ; the sides of the head 
dark grey (not blackish); the lower parts of a clearer slate-grey. Under tail-coverts 
tipped with white as in 7. x. huberi. 
Wing 78—81 ; tail 60—64 mm. 
? ad. Agrees with 7. x. nigrocinereus in the colour of the top and sides 
