Range. - Mountains of western Mexico north to southern Arizona.

This species has the black more extended on the throat and the under parts are grayish of a lighter shade than the upper, the cheeks, however, remaining white. Their nests are in hollow stubs and the eggs are indistinguishable from those of the foregoing Chickadees.

737 Mexican Chickadee Penthestes Sclateri 1486

735b-737-738