_Thryomanes_, SCLATER, Catal. Am. Birds, 1861, 21. (Type _Troglodytes
bewickii_.)
[Line drawing: _Thryothorus bewickii._
2047 ♂]
There are three strongly marked geographical varieties of “Bewick’s
Wren,” separable by quite constant characters. Of these the Mexican
(_leucogaster_) and the typical form from eastern North America
(_bewickii_) differ most in coloration, while the western (_spilurus_)
is intermediate in this respect, but with a longer bill than in the
other two. The peculiarities of the three forms are expressed on
page 141.
Thryothorus bewickii, var. bewickii, BONAP.