164 ROCKY MOUNTAIN ANTCATCHER, 
of this difference, and in the (French) “‘ New Dictionary of 
Natural History,” he has separated the more southern species, 
under the name of Tyrannus violentus. In colour, that bird 
strongly resembles our Muscicapa savanna, but it is consider- 
ably smaller, and has different habits, being gregarious; whilst 
the savanna, as we have already stated, is a solitary bird. 
Another species for which ours may be readily mistaken is 
the Tyrannus bellulus, Vieill., which, however, is much larger, 
with a still longer tail, differing also by having a large black 
collar extending to each corner of the eye, margining the white 
throat ; and the head of the same bluish grey colour with the 
other superior parts of the body; the remaining under parts 
being of the same colour, with a narrow brown line in the 
middle of each feather ; and by having a whitish line on each 
side of the head behind the eye, extending to the occiput. The 
Tyrannus bellulus is a native of Brazil. 
ROCKY MOUNTAIN ANTCATCHER. 
(Myiothera obsoleta.) 
PLATE I.—Fie. 2. 
Troglodytes obsoleta, Say, in Long’s Expedition to the Rocky Mountains, 
vol. li. p. 4.—Philadelphia Museum, No. 2420. 
TROGLODYTES OBSOLETA.—Say.* 
Myiothera obsoleta, Bonap. Synop. p. 73. 
Tuts bird is one of those beings which seem created to puzzle 
the naturalist, and convince him that Nature will never conform 
to his systems, however perfect his ingenuity may be capable 
of devising them. ‘This will become sufficiently apparent 
when we consider in what manner different authors would have 
arranged it. 
We cannot positively decide whether Vieillot and his fol- 
* We prefer retaining this bird for the present in Troglodytes. The 
habits, colour, and marking, nest and call, of this bird, bring it nearer to 
thewrens. There is no question, however, of its being an aberrant form, 
wherever it may rank.—ED. 
