590 U. S. P. R R. EXP. AND SURVEYS ZOOLOGY — GENERAL REPORT. 
List of specimens. 
Catal. 
No. 
3ex 
Locality. When collected. 
Whence obtained. 
0>ig. 
No. 
Length. 
Stretch 
of wings 
Wing. 
Remarks. 
8305 
8357 
Rio Grande, Tex... Oct. 2, 1855 

4052 
9.104 
<? 
N.Leon, San Diego. Mar. — , 1853 
Lt. Ci uch ... 
M. Verreaux 
118 
29883 
11.00 
14. 25 

4. 75 
Eyes dark brown ; 
feet lead color. 
i 
PERISOREUS, Bonap. 
Perisoreus, Bonap. Saggio di una dist. met. 1831. Type Corvus canadensis ? 
Dysomithia, Swainson, F. B. Am. II, 1831, 495. Same type. 
Ch. — Feathers lax and full, especially on the back, and of very dull co'ors, without any blue. Head without distinct crest. 
Bill very short ; broader than high. Culmen scarcely half the length of the head ; straight to near the tip, then slightly 
curved ; gonys more curved than culmen. Bill notched at tip. Nostrils round, covered by bristly feathers. Tail about equal 
to the wings ; graduated. Tarsi rather short ; but little longer than the middle toe. 
This genus includes the species of dullest colors among all of our jays. It has, too, the shortest 
bill, and with this feature hears a very strong resemblance in many respects to some of the 
titmice. 
The dates of the two names mentioned above are the same, but as Gray finds Perisoreus to 
possess actual priority I follow him in this, not having a copy of the " Saggio" at hand. 
PERISOKEUS CANADENSIS, Bonap. 
Canada Jay. 
Corvus canadensis, Linn. Syst. Nat. I, 1766, 158.— Forster, Phil. Trans. LXII, 1772, 382.— Wilson, Am. Orn. Ill, 
1811, 33 ; pi. xxL— Bon. Obs. 1824, No. 42.— Aud. Orn. Biog. II, 1834, 53 : V, 1839, 208 ; 
pi. 107. 
Garrulus canadensis, Bon, (Saggio, 1831?) Syn. 1828, 58.— Swainson, F.JBor. Am. II, 1831, 295.— Nuttall, Man. 
I, 1832, 232.— Aud. Syn. 1839, 155.— Ib. Birds Amer. IV, 1842, 121 ; pi. 234. 
Dysornilhia canadensis, Swainson, F. Bor Am. II, 1831. Appendix. 
Perisoreus canadensis, Bon. List, 1838. — Ib. Conspectus, 1850, 375. — Cab. Mus. Hein. 1851, 219. — Newberry, Rep. 
P. R. R. Surv. VI, iv, 1857,85. 
Garrulus fuscus, Vieillot, Nouv. Diet. XII, 1817, 479. 
Pica nuchalis, Wagler, Syst. Av. 1827. Pica No. 14. 
Garrulus trachyrrhynchus, Swainson, F. Bor. Am. II, 1831, 296 ; pi. Iv. Young. 
" Coracias mexicanus, Temminck," Gau. 
Sp. Ch. — Tail graduated ; lateral feathers about one inch shortest. Wings a little shorter than the tail. Head and neck, 
and fore part of breast white. A plumbeous brown nuchal patch, becoming darker behind, from the middle of the crown to 
the back, from which it is separated by an interrupted whitish collar. Rest of upper parts ashy plumbeous ; the outer primaries 
margined, the secondaries, tertials, and tail feathers obscurely tipped witli white. LJeneath smoky gray." Crissura whitish. 
Bill and feet black. Length, 10.70 ; wing, 5.75 ; tail, 6.00 ; tarsus, 1.40. 
Ilab. — Northern America into the northern parts of United States from Atlantic to Pacific ; more south in Rocky mountains. 
The young of this species are every where of a dull sooty brown, lighter on the middle of the 
belly, and more plumbeous on the wings and tail. With increasing age the region about the 
base of the bill whitens, and this color gradually extends backwards until the whole head, 
excepting the occiput and nape, is white. The under parts are sometimes whiter than in the 
typical specimens. 
