10. Sitta pygmæa, Vig. Cal., 3342.
11. Certhia americana, Bon. ♂ Pa., 827.
Sp. Char. Above ashy-blue. Top of head and neck black. Under parts and sides of head to a short distance above the eye white. Under tail-coverts and tibial feathers
brown; concealed primaries white. Bill stout. Female with black of head glossed with ashy. Length about 6 inches; wing about 3.75.
Hab. United States and British Provinces; west to the Valley of the Missouri.
Sitta aculeata.