STERCORARIID.E — THK SKUAS AND JAEGERS — STERCORARIUS, 335 



novor approaching the Ltvus mar hi us. They remained in the harbor until the gale 

 liiul abated, when they all went to sea. 



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

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



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

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

 (jlive drab, sparingly spotted with ylate-colored markings, and others of botli a light 

 ;uid a dark raw-umber color. Thest are chiefly at the larger end, where they become 

 CDuflueut. There are also a very ftiw scattered dots of black. 



StercorariuB parasiticuB. 



PABASITIC TaEGEB; BICHABDSOR'S JAEGER. 



Laras parasitinis, Linn. S. N. eJ. 10, I. 1758, 136 ; cd. 12, I. 170ij, 'J2(J. 



Slermrarius parasiticus, Schaff. Mus. Oiii. 177t>, 62, pi. 37. — Lawk, in Ikird's 15. N. Am. 1858, 



83!). — lUiim, Cat. N. Am. R. 1859, no. 654. — C'ouk.s, Key, 1872, 309 ; Check List, 1S73, no. 



541 ; cd. 2, 1882, no. 766 ; I?. N. W. 1874, 611. 

 Calii rradcs parasita, Pall. Zoog. Kosso-As. IL 1826, 310. 

 ? Calharada coprolhcrcs, HlirxN. Oin. Uoi'. 1764, 38. 



Calharada ccpphus, HkiJnn. Orn. Hor. 1764, 36. — Lkacii, Syst. Cat. 1816, 39. 

 Lnriiscrrpidatus, Banks, Hawkesworth's Voy. II. 1773, 15. — G.M. S. X. II. 1788, 602. 

 Skrcoriirius crepidatus, Vieill. Nouv. Diet. 1819, 155. — Saundkk.s, P. Z. S. 1876, 326. — KiDGW. 



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

 Lcslris Uichanlsoni, Sw. & Kicii. F. B. A. II. 1831, 433, id. 73. — Xrir. Man. II. 1834, 319. - 



AuD. Orn. Biog. III. 1835, 503 ; Synop, 1839, 332 ; P.. Am. VII. 1844, 190, \A. 452. 

 Lfi^tris Boji, SMccpii, licnickii, BisEii.M, Lehib. Eur. Vog. 1824, 991, 993, 996. 

 Lislris thuliaca, PiiEVEit, Reisc n. Island, 1862. 

 Lcslris spinicandus, IlAr.DV, Ke\'. et Mag. Zool. 1854, 657. 

 Sterconirius tcphras, .Mai.mgr. J. f. O. 1865, 392. 

 Skrcorarius asiaticiis, HrsiE, Stray Fcath. 1873, 269. 



Had. Northern part of noithcni lieniispliere ; south in America to New York, Illinois, and 

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

 Breeds in the Barren Ground.s of Arctic America. 



Si'. Chau. Adult, light ^^ihase: Entire pileuni, with lores, grayish brown; rest of the hc'id, 

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



Adult, dark phase . 



tiiij,'ed with straw-yellow. Upper parts uniform brownish slate, becoming gradually ilarker on 

 the primaries and tail. Crissum uniform brownish gray. "Rill grayish black, the up|)er part 

 hluisii ; iris brown ; legs and feet black" (ArnUBON). Adult, dark phase : Entirely nniforni dark 



