NATURAL SCIENCES OF PHILADELPHIA. 125 



Prodromus Isl. Orn. 1822. Lesson, Traite d'Ornith. 1831. Keyserling 

 et Blasius, Wirbelth. Europ. 1840 ; et auctorum aliorurn. 

 Megalestris, Bonaparte, Conspectus Avium, 1856, p. 206. Typus Larus catar- 

 ractes, Linn. 



1. Buphagus skua Coues ex Briinnich. 



"Skua Hojcri, Ray, Synopsis Avium, 128." 



Larus fuscus, Brisson, Ornithologie, vi. 1760, p. 165. "Scopoli, Bemerk. Natur- 



Gesch. 1770, 90." 

 Catharacta skua, Briinnich, Ornithologia Borealis, 1764, 33. No. 125. 

 Catarracta skua, Retzius, Fauna Suecica, 1800, 161, No. 123. Bonaparte, 



Cat. Met. Ucc. Europ. 1842, 79. Bonaparte, Rev. Crit. Degland's 



Ornith. Europ. 1850, 202. 

 Catarractes skua, Pallas, Zoographia Rosso-Asia?, ii. 1811, 309. Stephens, 



Shaw's Gen. Zool. 1825, xiii. 215. 

 Cataractes skua, Macgillivray, Man. Orn. ii. 1S42, 255. 

 Catarractes vulgaris, Fleming. (fideBp.) 

 Catarractes fusca, Leach, (fide Bp.) 

 Lcstris skua, Brehm. (fide Bp.) 



Larus catarractes, Linna?us, Systema Naturse, i. 1776. Gmelin, Systema Na- 

 ture, i. 1788, 603. Latham, Index Ornithologicus, ii. 1790, 818. 

 Larus keeask, Latham, Index Ornithologicus, ii, 1790, 818. 

 Lestris catarractes, Illiger, Prodromus, 1811, 273. Faber. Prodromus Island. 



Ornith. 1822, 102. Temmimk, Manuel d'Ornith. ii. 1820, 792. Tem- 



minck, Manuel d'Ornith. iv. 1840, 494. Bonaparte, Synopsis, 1826, No. 



304. Nuttall, Man. Ornith. ii. 1834, 312. Schlegel, Rev. Crit. Ois. Eur. 



1844, 84. 

 Lestris catharactes, Brehm, Naturg. Europ. Vog. 1S23, 739. 

 Lestris catharractes, Schinz, Europ. Fauna, 1840, i. 387. 

 Lestris catarrhactes, Kaup, Sk. Ent. Europ. Thierw. 1829, 64. Keyserling et 



Blasius, Wirbelth. Europ. 1840, i. 239. 

 Stercorarius catarrhactes, Vieillot, Nouv. Diet. d'H. N. 1817, xxxii. 154. 



Vieillot, Fauna Frang. 1828, 385. Degland, Orn. Europ. 1849, ii. 



289. Gray, Genera Avium, iii. 1849, 652. 

 Stercorarius catarractes, Bonaparte, Consp. Avium, 1836, ii. 206. Lawrence, 



General Report Birds N. A. 185S, 838. 

 Stercorarius cataractes, Selys-Longchamps. Fauna Belg. 1842, 155. 

 Stercorarius catharractes, Des Murs, Traite d'Ool. Ornith. 1860, 551. 

 Stercorarius pomarinus, Vieillot, Galerie d'Ois. ii. 1834, 220 ; sed non Temm. 



nee auctorum ! 

 Sp. ch. Above blackish brown, more or less variegated with chestnut and 

 whitish ; each feather being dark-colored, with a spot of chestnut towards its ex- 

 tremity, which in turn fades into whitish along the shaft towards the tip of 

 each feather. On the latero-nuchal region, and across the throat, the chest- 

 nut lightens into a decided reddish yellow, the white being as a well-defined, 

 narrow, longitudinal streak on each feather. The crown, post-ocular and 

 mental region have but little whitish. Inferiorly, the plumage is of a blended 

 fusco-rufous, lighter than on the dorsum, with a peculiar indefinite plumbeous 

 nuance. The wings and tail are blackish ; their rhachides white, except towards 

 the apices ; the remiges and rectrices white for some distance from the bases. 

 This white on the tail is entirely concealed by the long tail-coverts, but ap- 

 pears on the outer primaries as a conspicuous spot. The bill and claws are 

 blackish horn ; the feet pure black. 



Bill from base to tip 2-10 ; to end of cere 1*20 ; gape 3-00 ; height at base 

 75 ; width a little less ; rami 1-60 ; gonys *50 ; wingl6'00 ; tail 6*00 ; tarsus 

 2-70 ; middle toe and claw 3*10. 



1863.] 



