STERCORARIID.'E — THE SKUAS AND JAEUERS — STERCORARIUS. 335 



never approaching the Larus marinus. They remained in the harbor until the gale 

 had abated, when they all went to sea. 



A single example of this species was procured on the Prybilof Group by Mr. Elliott, 

 and was the only one seen by him. It is a rare visitor to those islands. 



An egg of this species, procured by Mr. Kunilien in Greenland, measures 2.25 inches 

 in length and 1.70 in breadth. Its shape is a rounded ovoid ; its ground-color a deep 

 olive drab, sparingly spotted with slate-colored markings, and others of both a light 

 and a dark raw-umber color. These are chiefly at the larger end, where they become 

 confluent. There are also a very few scattered dots of black. 



Stercorarius parasiticus 



PARASITIC JAEGER; RICHARDSON'S JAEGER. 



Larus parasiticus, Linn. S. N. ed. 10, I. 1758, 136 ; ed. 12, I. 176C, 226. 



Stercorarius parasiticus, Schaff. Mus. Orii. 1779, 62, pi. 37. — Lawr. in Baird's B. N. Am. 1858, 



839. — Baird, Cat. N. Am. B. 1859, no. 654. — CouES, Key, 1872, 309 ; Check List, 1873, no. 



541 ; ed. 2, 1882, no. 766 ; B. N. W. 1874, 611. 

 Catarractcs parasita, P.\ll. Zoog. Rosso- As. IL 1826, 310. 

 ? Catharacta co2}rotheres, Brunn. Orn. Bor. 1764, 38. 



Catharacla cepphus, BkIjnn. Orn. Bor. 1764, 36. —Leach, Syst. Cat. 1816, 39. 

 Larus crepidatiis, Banks, Hawkesworth's Voy. IL 1773, 15. — Gm. S. N. IL 1788, 602. 

 Stercorarius crepidatus, Vieill. Nouv. Diet. 1819, 155. — Saunders, P. Z. S. 1876, 326. — Ridgw. 



Nom. N. Am. B. 1881, no. 698. 

 Lestris Eichardsoni, Sw. & Rich. F. B. A. IL 1831, 433, pi. 73. — Nutt. Man. II. 1834, 319. - 



AUD. Orn. Biog. III. 1835, 503 ; Synop, 1839, 332 ; B. Am. VII. 1844, 190, pi. 452. 

 Lestris Boji, Schlecpil, Bcnickii, Brehm, Lehrb. Eur. Vog. 1824, 991, 993, 996. 

 Lestris thuliaca, Preyer, Reise n. Island, 1862. 

 Lestris spinicaudus, Hardy, Rev. et Mag. Zool. 1854, 657. 

 Stercorarius tephras, ]\Iai.mgr. J. f. 0. 1865, 392. 

 Stercorarius asiaticus, Hi'ME, Stray Feath. 1873, 269. 



Hab. Northern part of northern hemisphere ; south in Americ<a to New York, Illinois, and 

 Colorado, and even to Brazil (Rio de Janeiro ; Jide Saundeks, Jour. Linn. Soc. XIV. 392). 

 Breeds in the Barren Grounds of Arctic America. 



Sp. Char. Adult, light phase: Entire pileum, witli loves, grayish hrown ; rest of the head, 

 with entire neck and lower parts as far as the crissum, white, the head and neck more or less 



;>"^"A\\^/"'''''' 



»*>" 



Adidt, dark i)hase. 



tinged with straw-yellow. Upper parts uniform brownish slate, becoming gradually darker on 

 the primaries and tail. Crissum uniform brownish gray. "Bill grayish black, the upper part 

 bluish ; iris brown ; legs and feet black" (Audubon). Adult, dark phase: Entirely uniform dark 



