SETOPHAGA. 
53 
primary groups of birds, are found to correspond. But 
if we merely admit that the first division is into five, 
and not three, we still have the same results : not only 
are the five orders of birds and the five races of the 
perchers (Insessores) clearly represented, but also the 
five families of the Dentirostren, the five subfamilies 
of the Sylviadte, and the five genera of Farus com- 
pletely typified. Finally, we sec the five subgenera of 
one group beautifully represented by those in the 
other. With regard to the analogy between Mniotilta 
and Egithina, the testimony of M. Vieillot appears to 
us conclusive. It is, indeed, not a little remarkable, 
that he should, in the first instance, merely separate 
Egithina leucoptera, as a species, from Mniotilta, and 
that, subsequently, he should characterise it as a dis- 
tinct genus. 
(60.) The genus Sylmcola is immediately followed 
by that of Setophaga, comprising the flycatching war- 
blers ; and to these, the subgenus Dumecola Sw. opens 
an immediate passage. The group now before us has 
many striking peculiarities. In the first place, it con- 
tains birds which have long been arranged in popular 
systems with the true flycatchers, from which, how- 
ever, they are decidedly separated by the length of 
their legs and the structure of their wings. For the 
latter we have been prepared, by the more rounded 
wings of Burweco/a, where the first (and often the second) 
quill is graduated, and slightly shorter than the third ; 
while the length of their feet, and the general structure 
of these members, at once indicate that they are used 
®ud adapted for constant exercise. Like all the tit- 
Warblers {Sglvkola), the Setophagec hunt for flying 
insects from bough to bough j they are, in fact, fly 
hunters ; and thus differ most essentially from the true 
flycatchers, who watch for their prey in a sedentary 
position, and only seize it when it comes sufficiently 
near. The most typical examples of this singular 
group are from Mexico, and have hitherto only been 
noticed by us in a brief Synopsis on the new birds of 
B 3 
