78 
NORTH AMERICAN BIRDS. 
” Genus PICICORVUS, Bonap. (Page 76.) » 
P. columbianus. • Color bluish-ash, changing to white on forepart of head. Wings 
greenish-black, the secondaries and tertials broadly tipped with white; tail white, its 
central line above black. Axillars plumbeous-black. Length, 12.00 ; wing, 7.00 ; tail, 
4.30 ; tarsus, 1.20. Hab. Prom Rocky Mountains to Pacific. East to Fort Kearney, 
north to Sitka, south to Arizona. ( Clarke's Crow.) 
Genus GYMNOKITTA, Pr. Max. (Page 76.) 
Gr. cyanocephala. Dull blue, paler on the abdomen, the middle of which is tinged 
with ash ; the head and neck of a much deeper and more intense blue, darker on the 
Chin and forepart of the throat whitish, streaked with blue. Length, 10.00 ; 
tail, 4.50 ; tarsus, 1.50. Nesting not known. Hab. Rocky Mountains of 
Colorado, to Cascade Mts. of California and Oregon. Not on the Pacific coast? South 
to New Mexico and Arizona. (Maximilian's Jay.) 
wing, 5.90 ; 
2 Subfamily GARRULINiEJ. (Page 76.) | 
A. Nostrils moderate, completely covered by incumbent feathers. 
a. Tail much longer than the wings ; first primary attenuated, falcate. 
Pica. Head without crest. (Page 78.) 
b. Tail about as long as the wings ; first primary not falcate. 
Cyanura. Head with lengthened narrow crest. Wing and tail 
blue, banded with black. (Page 79.) 
Cyanocitta. Head without crest. Above blue, with a gray patch 
on the back. No bands on wing and tail. (Page 80.) 
Perisoreus. Head full and bushy. Bill scarcely half the head, 
P with white feathers over the nostrils. Plumage dull. (Page 82.) 
Xanthoura. Head -without crest. Color above greenish; the 
head blue ; lateral tail-feathers yellow. (Page 81.) 
B. Nostrils very large, naked, uncovered by feathers. 
Psilorhinus. Head not crested ; tail broad ; wings two thirds as 
long as the tail. (Page 82.) 
Calocitta. Head with a recurved crest ; wings less than half as 
long as the tail. (Mexican.) 
5JJJ Genus PICA, Cuvier. (Page 78.) S5 
P. caudata. Head, neck, breast, interscapulars, lining of wings tail-coverts 
and tibiae, deep black ; wings metallic greenish-blue ; tail rich metallic green, the 
feathers passing through bronze and reddish-violet into violet-blue, at their tips. 
Scapulars, abdomen, sides, flanks, and inner webs of primaries, pure white. 
Sexes alike ; young similar. Length about 19 inches. Nest enclosed in an 
immense thorny ball, with an opening on the side. Eggs from six to ten ; gray- 
ish-white, thickly and closely blotched and dotted with purplish-brown. 
a. Bill and bare space around the eye black. 
Wing, 7.50 ; tail, 9.50 or less, its graduation less than half its length, 
4.50 ; culmen, 1.20 ; tarsus, 1.75 ; middle toe, 1.05. Hab. Europe. 
(Common Magpie.) ........ var. caudata 
'memmasE^ 
