120 ON THE CLASSIFICATION OF BIRDS. 
are the internal types of form which appear to constitu 
some of the subgenera of Tanagra and Phenisoma: 
both, collectively, comprehend all the largest of the 
tanagers ; and they are, in general, so well marked with 
nearly all the characters of the family, that the expe- 
rienced ornithologist will be at no great loss to distin- 
guish them. We shall now proceed to the remaining 
groups. | . 
(134.) The aberrant Tanacrina, according to our 
present views, are comprised in the genera JVemosia, 
Aglaia, and Pipiilo: these we shall shortly notice. It 
seems evident that Leucopygia is the most aberrant form 
among the Phenisome : its unusually strong feet, with 
its short, entire, and compressed bill, leave us in n 
doubt that it is of the rasorial type; but whether it 
enters among the last-mentioned genera, or into the first 
of the aberrant groups, that is, Wemosia, is a matter 
of much uncertainty. The nearest affinity to this, in the 
genus we have just quitted, appears to be shown by Ta- 
chyphonus auricapillus*; while, on the other side, this” 
bird seems to be equally related to Nemosia ( fig. 167. b). 
This genus,— which, from its wings being longer, or at 
least more pointed than in any others, we take to be a fis- 
sirostral type,—is composed of very small slender-bodied 
birds, so much resembling warblers, that they have been 
classed as such by all writers; and even M. Vieillot, who 
has himself proposed the genus, has actually described 
the most typical species under the name of Sylvia rupi- 
capilla.t They are distinctly separated, however, from 
that family, by the thickness of their under mandible 
which is fully as stout as that of the upper: the feet 
are small, and rather short ; and the wings, which reach 
to half the length of the tail, have the first and second 
quills but very slightly abbreviated. These appear to 
be the typical distinctions; but as it is by this genus — 
that the tanagers, to all appearance, pass into the haw-— 
* The Tanagra auricapilla of prince Maximilian, and the T. Such#z oft 
our former Monograph. 4 
t La Vauvette a téte rousse. Sylvia ruficapilla Gal. des Oiseaux. The 
figure represents the legs double the length they are in nature. 
