Other Names: none
Distribution : woodlands of northwestern Mexico.
Size: 11-13 cm in length.
Plumage: Adults are blue-gray on the uppersides with white undersides and a long black tail with white outer bands on the base. The undertail is extensively white, showing black only along a thin vertical center line and at the very tip. Males show a prominent black cap. The beak and legs are gray and the eyes are black.