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resemble average specimens of 7. aldipectus, in the paleness of the lower parts, 
the tinge of the back, etc. In view of this great individual variation I consider 
it impossible to separate the Amazonian race 7. twentoptera. 
T. a. albipectus is thus seen to inhabit Cayenne, Surinam, British Guiana, and 
Eastern Venezuela (Caura), and to range southwards to the main valley of the 
Amazons (from Para to Mandos) and its southern tributaries (Tocantins, Tapajéz, 
Rio Madeira, and Purts). 
On the Rio Jurud and in Eastern Peru, however, a small, darker form is met 
with. Cf. Nov. Zool. xiv. 1907, p. 3. 
[13. Odontorhynchus cinereus Pelz. 
Odontorhynchus cinereus Pelzeln, Zur Orn, Bras. i. p. 67 (1867.—Salto do Girao). 
Right bank: Salto do Girao (Natterer). 
Thanks to the kindness of my friend Dr. Lorenz, I have been enabled to 
examine the type belonging to the Vienna Museum. Though quite distinct 
generically, Odontorhynchus is perhaps nearest to Thryophilus, but may be 
readily distinguished by the strongly curved culmen with a very distinct sub- 
terminal notch. The style of coloration, too, is very different. The type, an 
immature female, measures: wing 52; tail 493; bill 12 mm 
The Paris Musenm possesses a male obtained on the Rio Javarri in 
1846, by Castelnau and Deville. It is larger (wing 59 mm., tail incomplete), 
with apparently a broader, stronger bill (which, however, is mach damaged by 
the shot), the upper parts rather more of an olive-grey, the cross-bands of the 
tail mach broader, the lower parts dull light grey (instead of white), etc. Until 
additional specimens come to hand it cannot be decided whether the Javarri bird 
is specifically identical with O. cinereus or not. | 
14. Troglodytes musculus clarus Berl. & Hart. 
[Troglodytes musculus Naumann, Vég. Deutschl. iii, p. 724. table (1823.—Babhia). | 
Troglodytes musculus clarus Berlepsch & Hartert, Nov, Zool. ix. p. 8 (1902.—Bartica Grove, 
British Guiana). 
No. 730. d ad., Calama, 26. x. 1907. “Tris greyish brown, feet grey, bill 
black, below greyish red.”—Wing 52; tail 38; bill 14 mm. 
Agrees in coloration with our large series from Parad, Venezuela (Caura, 
Cumana), Trinidad, etc. This is the first record from the Rio Madeira, and the 
southernmost locality of the species in Brazil. 
Farther to the south, on the Rio Guaporé (Villa Bella de Mattogrosso), in 
Western Mattogrosso (Cuyabd, etc.), and Eastern Bolivia, it is replaced by 
T. musculus rex Berl. & Lev.* 
15. Oporornis agilis (Wilson). 
Sylvia agilis Wilson, Amer. Ornith. v. p. 64, pl. 39. fig. 4 (1812.—Connecticut ; Pennsylvania near 
Philadelphia). 
No. 789, (gd) imm,, Allianca, 16. xi. 1907. “Iris brown, feet greyish brown, 
bill blackish, below grey.”—Wing 71; tail 47 ; bill 112 mm. 
This bird I have compared with specimens from Cambridge (Mass.), Illinois, 
* T. furvus Gm. subsp. n. rex Berlepsch & Leverkiihn, Ornis vi. p. 6 (1890.—Samaipata, E. Bolivia) ; 
Hic aa : : 
ieiaeds platensis (errore!) Pelzeln, Zur Orn, Bras. i. p- 48 (part.: Mattogrosso, Cuyabé: specimens 
