324 
U. S. P. R R. EXP. AND SURVEYS ZOOLOGY — GENERAL REPORT. 
The following is a synopsis of the North American species : 
Common characters. — Color ahove hluish ash. Beneath white ; scapulars whitish along the 
wing. A black patch from the bill through and behind the eye. A white patch at the base 
of the primaries, and on the tips of the secondaries. All the tail feathers, except the median, 
tipped with white, and with a basal patch of the same. 
A. — Distinctly banded beneath. Black of eye stripe interrupted below the eye by a white 
crescent. No black at the base of the bill above. 
Above soiled light bluish ash. Upper tail coverts, forehead, and side crown hoary. 
G. borealis. 
B. — Uniform white (or very obsoletely banded in the young) beneath. A continuous patch 
through the eye from the bill. A narrow frontal line of black. 
Above dark bluish slate. Forehead, sides of crown, and upper tail coverts nearly uniform 
with the back C. ludovicianus. 
Above light bluish ash. Forebead, sides of crown, and upper tail coverts, hoary white, 
the latter sometimes glossed with ashy G. excubitoroides. 
Comparative measurements of species. 
Catal. 
No. 
Species. 
Locality. 
Sex. 
Length. 
ofwings. 
Wing. 
Tail. 

Tarsus 
Middle 
toe. 
alone. 
Bill 
above. 
Along 
g:.pe. 
Specimen 
measured. 
907 
do. 
7196 
do. 
3054 
3050 
do. 
10172 
8720 
Collyrio borealis 
9.20 
9.83 
9.80 
10.73 
8.50 
8,20 
8.80 
8.80 
8.64 
14.50 
4.36 
4.50 
4.58 
4.88 
1.02 
0.83 
0.3U 
0.60 
1.10 

Fresh... . 
Shoaiwater bay, W. T. 

4.8S 
1.02 
0.82 
0.30 
0.58 
1.02 
14 50 
Fresh..., 
Collyrio ludovicianus. 
3.72 
3.75 
3.92 
4.08 
4.24 
4.42 
1 04 
1.06 
0.86 
0.30 
0.26 
0.62 
0.62 
0.92 
0.02 
9 
12.00 
Fresh.... 
Dry 
Collyrio excubitoroides 
,l.< 
Marion Co., Illinois. . 
Fnrt Viima f!nl 
3 
4.26 
4.58 
1.05 
1.06 
0.86 
0.85 
0.26 
0.30 
0.63 
0.63 
0.92 
0.92 
COLLYRIO BOREALIS, Baird. 
Great Northern Shrike; liutchcr Bird. 
Lanius septentrionalis, Bon. Syn. 1828, 72.— Bon. List, 1838.— Ib. Rev. et Mag. Zool. 1853, 294.— Nuttall, Man. 
I, 1832, 258.— Is. I. 2d ed. 1840, 285. (Not of Gmelin.) 
Lanius borealis, Vieillot, Ois. Am. Sep. 1, 1807,90 ; pi. 1.— Sw. F. B. Am. II, 1831, 111.— Aud. Syn. 1839, 157.— 
In. Birds Amer. IV, 1842, 130 ; pi. 23G. 
Lanius txcubitor, Forster, Phil. Trans. LXII, 1772, 382.— Wilson, I, 1808, 74 ; pi. v. f. 1.— Bon. Obs. 1826 —Aud. 
Orn. Biog. II, 1834, 534 ; pi. 192. 
Sp. Ch. — Above light bluish ash, obscurely soiled with reddish brown. Forehead, sides of the crown, scapulars, and upper tail 
coverts hoary white. Beneath white, the breast with fine transverse lines. Wings and tail black; the former with a white 
patch at base of primaries and tips of small quills ; the latter with the lateral feathers tipped with white. Bill blackish brown ; 
considerably lighter at thehase. Black stripe from the bill through and behind the eye, but beneath the latter interrupted by a 
whitish crescent. Female and young with the gray soiled with brownish. Length, 9.85 ; wings, 4.50 ; tail, 4.80 ; its gradua- 
tion .90. 
Hab. — Northern regions from Atlantic to Pacific ; in winter south, through most of the United States. * 
Upper parts of head and body pure clear bluish ash, soiled in the slightest possible manner ; 
changing on the rump and scapulars to ashy white ; nearly pure white on the outer edge of the 
latter, behind. Tips of upper coverts like the back. Forehead, and a stripe from the nostrils 
