680 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



S[tercorarius] catarrhactes Gray, Gen. Birds, iii, 1846, 652. 



Megalestris catarrhactes Saunders, Cat. Birds Brit. Mus., xxv, 1896, 315 (Devon- 

 shire, England; Shetland; Faroe Islands), 458 (Faroes). — Nicoll, Ibis, 1904, 

 33, in text (Madeira Islands, Nov.). 



[Megalestris] catarrhactes Sharpe, Hand-list, i, 1899, 143. — Forbes and Robinson, 

 Bull. Liverp. Mus., ii, no. 2, 1899, 58 (Shetland Islands). 



Catarracta fusca Leach, Syst. Cat. Mam., etc., Brit. Mus., 1816, 40; in Thomp- 

 son's Ann. Philos., xiii, 1819, 61 (Faroe Islands). 



Lestris fusca Dubois (C. F.), PI. Col. Ois. Belg., iii, 1860, 238 and plate. 



Stercorarius fuscus Dubois (A.), Consp. Av. Eur., 1871, 33; Bull. Mus. Roy. 

 Belg., iv, 1885, 22. 

 [?] [Larus] keeask Latham, Index Orn., ii, 1790, 818 (Hudson Bay; based on Esqui- 

 meaux Keeask Latham, Synopsis Birds, vi, 389; Pennant, Arctic Zool., ii, 71). 



Stercorarius pomarinus (not Lestris pomarinus Temminck) Vieillot, CJal. Ois., 

 ii, 1834, 220, pi. 288. 



C[ataractes] vulgaris Fleming, Hist. Brit. Anim., 1828, 137. 



Cataractes vulgaris Selby, Illustr. Brit. Orn., ii, 1832, pi. C; text, ii, 1833, 514. 



Cataracta minor Brehm, Naumannia, 1855, 293 (nomen nudum). 



Genus COPROTHERES Reichenbach. 



??Pomarinus<^ Fischer de Waldheim, Natioualmus. Naturg. zu Paris, ii, 1803, 185. 



(Type, by monotypy, P. fuscus Fischer =? Lestris pomarinus Temminck.) 

 Coprotheres Reichenbach, Av. Syst. Nat., 1850, pi. 5; Nat. Syst. Vog., Longi- 



pennes, 1852 (1853), p. v. (Type, Lestris pomarinus Temminck.) 



Medium-sized Stercorariidae (wing about 350-375 mm.) with mid- 

 dle pair of rectrices projecting conspicuously beyond the rest, broad 

 throughout, with tips broadly rounded or subtruncate, twisted semi- 

 vertically for distal half, and depth of bill at base greater than its 

 width at same point. 



Bill much shorter than head, the exposed culmen shorter than 

 middle toe without claw, about three-fourths as long as tarsus, its 

 depth at base slightly exceeding its width at same point. Wing 

 long and pointed, the longest primary (outermost) exceeding distal 

 secondaries by more than half the length of folded wing; primaries 

 tapering distally, their tips pointed. Tail slightly graduated, less 

 than half as long as wing, the rectrices broad and subtruncate at 

 tips, including middle pair, which project more or less (usually about 

 75 mm.) beyond the rest and are twisted so that the plane of their 

 distal portion forms an angle of 45°, more or less, to the plane of 

 their basal portion. Tarsus much longer than middle toe without 

 claw, the acrotarsium covered by a single series of transverse scutella, 

 except on upper portion where those are replaced by irregular smaller 

 scales, similar to those covering sides of tarsus, these largest on outer 

 side, the planta tarsi covered with smaller tubercle-like conical or 

 spicular scales; outer toe nearly as long as middle toe, the inner much 

 shorter; hallux very short, its claw acute and but slightly curved; 

 claws of anterior toes relatively large, strongly curved, that of inner 



o Uu)fia, a lid, ccver; pis {pivos), nose. (Richmond.) 



