Geographical Distribution in Birds. 43 
3. Head and crest deep black, scarcely tinged with blue; 
back ashy (minimum amount of blue). Had. Rocky Mts. of 
the United States. Var. macrolopha.* 
No supraocular spot of white; greater wing-coverts not _bar- 
red with black; chin and throat not abruptly lighter than the 
adjacent portions (C. Steller?). 
1’. Head, crest and anterior part of the body, above and 
below, sooty black; no blue on the forehead; the blue of 
a 
Var. frontalis.t 
Like @ Stellert var. frontalis, all the races of C. coronata have 
the forehead streaked, but with milk-white instead of pale blue. 
Steller: var. frontalis, and coronata var. macrolopha, further agree 
in having the longest crests, most slender bills, and most con- 
trasted shades of blue, in the whole series; while O. Stelleri and 
ation of the bill, and contrasted shades of blue, with excess of 
heither black nor blue; while “A. 1” and “B. 1’” represent 
the shortest crest and stoutest bill, and uniform shade of blue, 
with excess of blue on the one hand and of black on the other. 
AS a summary of these facts, it appears evident that the 
Series of forms under consideration is divided into two well 
marked stocks, but that they intergrade at one point. The 
conclusion, then, must be that they are all modifications of one 
* CYANURA CORONATA var, MACROLOPHA. 
anocitta macrolopha Baird, P. A. N. 8., 1854, 118. 
Cyanura m. Baird, B. A. Am., 1858, 582. 
Hab. Central Rocky Mountains of the U. 8. 
YANURA 
t = oie RI var. STELLERI. os 
orvus Stellert Gm., 8. N., i, 1788, 370 (Sit ee 
Cyanura s. Sw., F. B. A., ii, 1831, 495. App. (descr. but not fig., Me3 is of 
cone a tecuetinte form between Stelleri and macrolopha /).—Baird, B, N. Am., 
, 581 
t Crancra 
STELLERI var. FRONTALIS. 
Cyanura Stelleri var. frontalis Ridgway. 
