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242. Cercomacra sclateri Hellm. 
Cercomacra sclateri Hellmayr, Nov. Zool. xii. pp. 286, 288 (1905.—Chyavetas, East Peru). 
C. caerulescens (nec Vieillot) Pelzeln, /.c. p. 84 (Borba, Salto do Girao, Rio Madeira ; Mattogrosso, 
Rio Guaporé), 
Nos. 90, 99, 401, 468. 3 ad., Calama, 22, 23. vi, 16, 27. viii, 1907.—Wing 
64—66; tail 69—70; bill 17—184 mm. 
No. 545. dad., Jamarysinho, Rio Machados, 13. ix. 1907.— Wing 66 ; tail 66 ; 
bill 17 mm. : 
Nos. 170, 571. 29% ad. Calama, 6. vii. 1907; Jamarysinho, 18. ix. 1907.— 
Wing 60 ; tail 64; bill 164, 17 mm. 
“ Tris grey or brown, feet black, bill black, lower mandible grey in females.” 
Typical of C. sclateri, with the bend of the wing largely white, and with 
distinct white apical margins to the upper wing-coverts. Two of the males are 
very nearly as dark slate-grey as the type from Chyavetas, while the others are 
paler schistaceous, more like the specimens from Parad and Itaitiba. An adult 
male from the Rio Paris (Bom Lugar) is scarcely paler underneath than Peruvian 
examples, but in the colour of the upper parts it resembles those from the Lower 
Amazons. 
To the range as given in Nov. Zool. xii. p. 288 the following localities are to 
be added :— 
N. Brazil: Sao Antonio do Prata (Hoffmauns, Snethlage), Rio Capim, Rio 
Guaméa (Snethlage) ; Rio Tapajéz: Itaitiba (Hoffmanns), Villa Braga (Snethlage). 
W. Brazil: Calama, Jamarysinho, Rio Madeira (Hoffmanns); Bom Lugar, Rio 
Purts (Snethlage), Teffé, Rio Solimoéns (Hoffmanns). Besides, I have examined, 
in the Paris Museum, 2 d¢ ad, 3 2? from Sarayacu, Eastern Peru, brought back 
by the Castelnau Expedition. 
243. Cercomacra nigrescens approximans Pelz. 
[Perenostola nigrescens Cabanis & Heine, Mus. Heinean. ii. p. 10 (1859,—Cayenne). ] 
Cercomacra approximans Pelzeln, Zur Orn. Bras. ii. pp. 85, 158 (1868.—Engenho do Gama and 
Mattogrosso, Rio Guaporé), 
C. nigrescens approvimans Hellmayr, Nov. Zool, xiv. 1907 p. 372 (Borba). 
No. 402. ¢ ad., Calama, 16. viii. 1907.—Wing 68 ; tail 64; bill 18 mm. 
Nos. 640, 642. ¢ imm., 3 juv., S. Isabel, Rio Preto, 8. x. 1907. 
Nos. 615, 636, 661. 2 9? ad., S. Isabel, Rio Preto, 3, 7, 10. x. 1907.—Wing 
63—65 ; tail about 57; bill 16,—17 mm. 
No. 795. 3 juv., Allianca, 20. xi, 1907 —Wing 65 ; tail 64; bill 16 mm. 
The series agrees perfectly with others from Itaitiba (Tapajéz) and some of 
Natterer’s typical specimens from the Guaporé. Peruvian skins (Pebas, Guaya- 
bamba, Huambo, aud Garita del Sol) are slightly different, the males being darker, 
more sooty both above and below, the females decidedly rufescent-brown (instead 
of dull brownish olive) on the back. Whether these characters are constant I am 
not in a position to say, owing to my material being too inadequate. C. serva (Scl.) 
is very nearly allied to C. ». approximans. Although it would appear that both 
species occur side by side in Bastern Ecuador as well as in certain districts of Pern, 
yet their relationship is not at all clearly understood. 
C. n. approximans ranges, in the east, to the left bank of the Tapajéz. 
