BIEDS LARIDAE STERCORARIUS PARASITICUS. 
839 
Sp. Ch. — Mull. Front, crown of the head, back, wings, and tail blackish brown ; sides and back part of the neck bright 
yellow ; throat and entire under plumage white, with a band of brown spots extending across the upper part of the breast ; 
sides and lower tail coverts barred with brown. Shafts of quills and tail feathers white ; bill greenish olive, black at the tip ; 
legs and feet black. The middle tail feathers extend beyond the others for about two inches. They are rounded at the end, 
and of a uniform breadth throughout. Length, 20 inches ; wing, 14 ; tail, 8 to 9 ; bill, 1| ; tarsus, 2. 
Hab.- — Labrador ; as far south as New York in winter. One specimen taken in summer at Harrisburg, Pa. 
Young birds have the plumage of the upper parts blackish brown ; of the lower grayish 
brown, with tbe feathers of tbe abdomen and lower tail coverts margined with dull ferruginous. 
Tarsi and base of the toes and webs yellow. 
List of specimens. 
Catal. 
No. 
Locality. 
When collected. 
Whence obtained. 
Collected by — 
1275 
2755 
Summer 
S. F. Baird 
Atlantic 
do 
J. J. Audubon 
STERCORAPJUS PARASITICUS, Temminck. 
The Arctic Skua. 
Lams parasiticus, Linn. Syst. Nat. I, 1756, 22G. 
Stercorarius parasiticus, Temm. Man. d'Orn. II, 1820, 796. 
Leslris parasiticus, Bonap. Synop. 1828, No. 307.— Ib Conspectus, II, 1856, 208. 
Leslris richardsonii, Swain. F. B. A. II, 1831, 433 ; pi. Ixxiii.— Nutt. Man. II, 1834, 319.— Aud. Birds Amer. VII, 
1844, 190 ; pi. cccclii. 
Sp. Ch.— Adult. Upper part of the head blackish brown ; nape and sides of the neck yellowish white ; remainder of upper 
plumage blackish brown ; wings and tail darker ; shafts of the primaries white ; under plumage white ; bill bluish at the base, 
black at the point ; tarsi and feet black. The central tail feathers extend beyond the others about three inches ; they taper 
slightly, varying but little in breadth until near the end, where they are abruptly accuminated, differing in this particular from 
all the other species. Length, 20 to 22 inches ; wing, 13| ; tail, S ! 2 ; bill, lj^ ; tarsi, 1J. 
Hab. — Arctic America ; breeds in the Barren Grounds ; coast of the United States from New York northward. 
List of specimens. 
Catal. 
No. 
Locality. 
Whence obtained. 
Collected by — 
2752 
9970 
2754 
2062 
S. F Baird 
do 
J. J. Audubon 
do 
J. Kimball 
do 
do 
T. M. Brewer 
New York 
