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, 815 (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 _—Forses and Rosinson, 
Bull. Liverp. Mus., ii, no. 2, 1899, 58 (Shetland Islands). : 
Catarracta fusca Leacu, Syst. Cat. Mam., etc., Brit. Mus., 1816, 40; in Thomp- 
son’s Ann. Philos., xiii, 1819, 61 (Faroe Islands). 
Lestris fusca Dusois (C. F.), Pl. Col. Ois. Belg., iii, 1860, 238 and plate. 
Stercorarius fuscus Dusors (A.), Consp. Av. Eur., 1871, 33; Bull. Mus. Roy. 
Belg., iv, 1885, 22. 
[2] [Larus] keeask Laraam, 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) Viento, Gal. Ois., 
ii, 1834, 220, pl. 288. ; 
Clataractes] vulgaris Fummine, Hist. Brit. Anim., 1828, 137. 
Cataractes vulgaris Seipy, Ilustr. Brit. Orn., ii, 1832, pl. C; text, ii, 1833, 514. 
Cataracta minor Bream, Naumannia, 1855, 293 (nomen nudum). 
Genus COPROTHERES Reichenbach. 
??Pomarinus® FiscHER DE WALDHEIM, Nationalmus. Naturg. zu Paris, ii, 1803, 185. , 
(Type, by monotypy, P. fuscus Fischer= ?Lestris pomarinus Temminck.) 
Coprotheres RutcHeNBACH, Av. Syst. Nat., 1850, pl. 5; Nat. Syst. Vég., Longi- 
pennes, 1852 (1853), p. v. (Type, Lestris pomarinus Temminck.) 
Medium-sized Stercorariide (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 these 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 
@ Tapa, a lid, cover; pls (duds), nose. (Richmond.) 
