A. Greater coverts, tertials, secondaries, and tail-feathers tipped broadly with white; lower parts generally, including lateral and under parts of head, whitish.
C. cristata. Head above, back, scapulars, lesser wing-coverts, rump and upper tail-coverts, light ashy purplish-blue; a narrow frontal band, a loral spot, streak behind the eye, and collar round the neck, commencing under the crest, passing down across the end of the auriculars and expanding into a crescent across the jugulum, black; throat tinged with purplish-gray, the breast and sides with smoky-gray; abdomen, anal region, and crissum pure white. Wing, 5.70; tail, 6.00; bill, 1.25; tarsus, 1.35; middle toe, .85; crest, 2.20. Hab. Eastern Province of North America.
B. No white on wing or tail; lower parts deep blue.
C. stelleri. Color deep blue, less intense than on wings and tail, except dorsal region, which may be deep blue, ashy-brown, or sooty-black. Head and neck dark grayish-brown, dusky-blue, or deep black, the throat more grayish.
a. No white patch over the eye; throat and chin not abruptly lighter than adjacent parts; secondary coverts not barred with black.
Whole head, neck, jugulum, and dorsal region plain sooty-black; no blue streaks on forehead, or else these only faintly indicated. The blue everywhere of a uniform dull greenish-indigo shade. Depth of bill, .45; crest, 2.60; wing, 6.00; tail, 6.00; culmen, 1.35; tarsus, 1.75; middle toe, 1.00. Hab. Northwest coast, from Sitka to the Columbia … var. stelleri.
Whole head, neck, jugulum, and dorsal region plumbeous-umber; the forehead conspicuously streaked with blue, and the crest washed with the same. The blue of two very different shades, the wings and tail being deep indigo, the body and tail-coverts greenish cobalt-blue. Depth of bill, .35; crest, 2.80; wing, 6.00; tail, 6.00; culmen, 1.25; tarsus, 1.55; middle toe, .90. Hab. Sierra Nevada, from Fort Crook to Fort Tejon … var. frontalis.
b. A patch of silky white over the eye; throat and chin abruptly lighter than the adjoining parts; secondary coverts barred distinctly with black.
Whole crest, cheeks, and foreneck deep black; the crest scarcely tinged with blue; dorsal region light ashy-plumbeous; forehead conspicuously streaked with milk-white. The blue contrasted as in var. frontalis. Depth of bill, .35; crest, 3.00; wing, 6.10; tail, 6.10; culmen, 1.25; tarsus, 1.65; middle toe, .90. Hab. Rocky Mountains of United States … var. macrolopha
Whole crest, cheeks, and foreneck deep black, the crest strongly tinged with blue; dorsal region greenish plumbeous-blue. The blue nearly uniform; forehead conspicuously streaked with bluish-white. Depth of bill, .35; crest, 2.80; wing, 5.90; tail, 5.90; culmen, 1.30; tarsus, 1.60; middle toe, .90. Hab. Highlands of Mexico … var. diademata.[56]