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MUSCICAPA VERTICALIS. 
emarginated ; the exterior feather is white on the outer 
web, the shaft being white on the exterior half, and 
brown on the interior. 
Say first described and named this bird in the second 
volume of the work above quoted, and he remarks that 
it is allied to the Tyr annus griseus and Tyr annus 
sulphuratus of Vieillot. There are many species for 
which the Arkansaw flycatcher might more readily 
be mistaken ; of these we may mention the crested 
flycatcher ( Muscicapa crinita') so well described by 
Wilson in his second volume ; and particularly the 
Muscicapa ferox * of Gin el in, a South American bird, 
the description of which agrees so well with the species 
we are now considering that it might be equally applied 
to either. Our bird differs from the two latter by that 
striking character, the white exterior web of the outer 
tail-feather. From the Crinita it may more especially 
be known by the spot on the crown, which does not 
exist in that species ; by not having the tail and wing- 
feathers rufous in any part ; and by having the primaries 
narrowed at tip, while the Crinita has them quite large, 
entire, and rounded. On a particular comparison with 
the Ferox , we shall perceive that the bill of that bird is 
flattened, broad, and carinate, whilst in the Verticalis it 
is almost rounded above. The general colour of the 
latter is, besides, much paler, and the tail is less deeply 
emarginated. 
The Arkansaw flycatcher appears to inhabit all the 
region extending west of the Missouri river. The 
specimen we have been describing is a male killed in 
the beginning of July, on the river Platte, a few days’ 
march from the mountains. 
* This bird had been incorrectly considered by Vieillot in his 
Natural History of North American Birds , as identical with the 
Muscicapa crinita , but, afterwards perceiving it to be a distinct 
species, he named it Tyrannus ferox. A specimen is, in the 
Philadelphia Museum, designated by the fanciful name of ruby- 
crowned flycatcher, (with this Say compared his Tyrannus 
verticalis before he stated it to be new,) and in the New York 
Museum three specimens are exhibited with the erroneous title of 
whiskered flycatcher ( Muscicapa harhata . ) 
