( 426 ) 
No. 617. gad. (winter plumage), 8. Isabel, 3. x. 1907. “Iris dark brown, 
feet greyish green, bill black.”—Wing 136; tail 60 ; bill 29 mm. 
[461. Plotus anhinga Linn. 
Plotus Anhinga Linnaeus, Syst. Nat. xii. 1. p. 218(1766.—ex Marcgrave : Eastern Brazil) ; Pelzeln, 
Le. p. 325 (Borba). 
Borba (Natterer). | 
[462. Palamedea cornuta Linn. 
Palamedea cornuta Linnaeus, Syst. Nat. xii. 1. p. 232 (1766.—ex Marcgrave & Brisson; Eastern 
Brazil and Guiana) ; Pelzeln, /.c. p. 315 (Bananeira). 
Cachoeira do Bananeira (Natterer). | 
[463. Alopochen jubata (Spix). 
Anser jubatus Spix, Av. Bras, ii. p. 84. pl. eviii. (1825.—“ ad ripam fl. Solimoéns ”). 
Chenalopex jubatus Pelzeln, I.c. p. 319 (Barra do Rio Guaporé). 
Rio Madeira: Barra do R. Guaporé (Natterer). | 
Il]. SUMMARY. 
In the foregoing account I have only dealt with the species that have actually 
been taken in the Madeira district, yet their number could easily be increased by 
adding those which were observed or collected by Natterer farther south, on the 
banks of the Rio Guaporé, as well as on the Rio Negro in the north, and which are 
very likely to occur also in the intervening country. The Rio Madeira faunistically 
belongs to the great Amazonian subregion. According to its geographical situation 
the avifanna shows a mixed character, being composed partly of Upper Amazonian 
forms, partly of species peculiar to the Lower Amazons, though there are, at the 
same time, a good many characteristic species not known to occur elsewhere. For 
many Upper Amazonian forms the Madeira Valley appears to constitute the easterly 
limit of their range. Quite a number of them reach the left bank of the river, 
while they are not found at all or represented by allied forms on the right side. 
Others are met with on both banks, but not recorded from any locality farther east. 
A certain difference apparently exists between the bird-life of Borba and that we 
find farther up in the Machados district. Many striking Lower Amazonian species 
extend along the south shore of the Amazons to Borba and even to the Rio 
Guaporé, occurring only on the right side, whose avifauna shows a decided 
similarity to that of the Tapajéz. Unfortunately, our knowledge of the ornithology 
of Western Mattogrosso is far from complete, resting exclusively upon Natterer’s 
researches ; still from the scanty information as yet available it would appear that 
the fauna of the Rio Guaporé is essentially Amazonian, while a very different lot 
of birds was met with by the great Austrian naturalist at Villa Maria and other 
places on the Upper Paraguay. 
The subjoined tabular lists may serve to illustrate the above conclusions. 
(A) Species peculiar to the Madeira Valley. Unless otherwise stated they are 
restricted to the right bank of the stream. 
