BIRDS — LARIDAE — STERCORARIUS PARASITICUS. 



839 



Sr. Ch. — .Idull. Kronl, crown of the head, back, wings, and tail blackish bruwn ; sides and back pari of the nock bright 

 yellow ; throat and entire under plumage white, with a band of brown epots extending across the upper part of the breast ; 

 sides and lower tail eoverUi barred with brown. ShafXs of quills and tail feathers white ; bill greenish olive, black at the tip ; 

 legs and fict bla' k. 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 1) ; hill, 1 J ; tarsus, 2. 



JJnb. — Labrador ; as far south as Now York in winter. One specimen taken in suninicr at ILirrisbnrg, Pa. 



Young birds have the plumage of the upper parts blackish brown ; of the lower grayish 

 brown, with the feathers of the abdomen and lower tail coverts margined with dull ferruginous. 

 Tarsi and base of the toes and webs yellow. 



List of sjKcimens. 



STERCORAKIUS PARASITICUS, Temminck. 



The Arctic Skna. 



Lams parasiticus, Linn. Syst. Nat. 1, 1756, 226. 

 Stercorarius parasiticus, Temm. Man. d'Orn. II, 1820, 796. 



Leslris parasiticus, Bonap. Synop. 1828, No. ."iOT. — Ib Conspectus, 11, 1856, 208. 



Lestris richardsonii, Swain. F. B. A. 11, 1831, 433 ; pi. Ixxiii.— Nutt. Man. II, 1834, 319.— An). Birds Amer. VII, 

 1844, 190 ; pi. cceclii. 



Sp. Ch. — .Idult. 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| j tail, 6| ; bill, If'j ; tarsi, IJ. 



Hob. — Arctic America ; breeds in the Barren Grounds ; coast of the United States from New York northward. 



List of specimens. 



