STERCORARIILVE — THE SKUAS AND JAEGERS — STERCORARIUS. 335 



never approaching the Larus marimis. 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. Kumlien 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. 8. X. ed. 10, I. 1758, 136 ; ed. 12, I. 1760, 226. 



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



839. — Baiiid, Cat. H, Am. B. 1S59, no. 654. — Coues, Key, 1872, 309 ; Check List, 1873, no. 



541 ; ed. 2, 18S2, no. 766 ; B. N. W. 1S74, 611. 

 Catarractes parasita. Pall. Zoog. Rosso- As. II. 1826, 310. 

 ? Catharacta coprotheres, Brunn. Orn. Bor. 1764, 38. 



Catharaeta cepphus, Brunn. Orn. Bur. 1764, 36. — Leach, Syst. Cat. 1816, 39. 

 Larus crepidatus, Banks, Hawkesworth's Voy. II. 1773, 15. — Gm. S. N. II. 178S, 602. 

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



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

 Lestris Richardsoni, Sw. & Rich. F. B. A. II. 1831, 433, pi. 73. — Nutt. Man. II. 1S34, 319. - 



Aud. Orn. Biog. III. 1835, 503 ; Synop, 1839, 332 ; B. Am. VII. 1S44, 190, pi. 452. 

 Lestris Boji, Schleepii, SenicHi, Brehm, Lehrb. Eur. Yog. 1824, 991, 993, 996. 

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

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

 Stercorarius tephras, Mal.mgr. J. f. O. 1865, 392. 

 Stercorarius asialicus, Hl'ME, Stray Feath. 1873, 269. 



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

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

 Breeds in the Barren Grounds of Arctic America. 



Sp. Char. Adult, light phase: Entire pileum, with lores, grayish brown; rest of the head, 

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



Adult, darlc phase. 



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 



