322 STERCORARIID^. 



same, though in a less degree ; the remaining under surface gradually 

 darkening to coffee-brown on the abdomen ; mantle, wings, and tail 

 chiefly umber-brown, as in M. antarctica : bill blackish, short and 

 stout ; tarsi and toes black. Total length 21 inches, culmen 2-3, 

 wing 15"5, tail 6*5, tarsus 2*6, middle toe with claw 2-7. 



The sexes appear to be alike externally. 



Eab. Victoria Land and the high Antarctic regions visited by 

 the ' Erebus ' and ' Terror,' 71°-76° S. lat. and 171°-178° E. long. 



a. Ad. sk. Possession Island, Victoria Dr. R. McCormick 



Land, Jan. 12, 1841 [P.]. 



{Dr. R. McCormick, E.N., (Type of species.) 



H.M.S. ' Erebus'). 



b. Ad. sk. Pack Ice, Antarctic Sea, 76° Dr. R. McCormick 



S., 178° E., Feb. 18, 1841 [P.]. 

 (Dr. R. McCormick). 



c-e. (S 2 ad. sk. Pack Ice, Antarctic Sea {Dr. Antarctic Expedition 



R. McCormick). [P.]. 



2. STERCORARIUS. „ 



Type. 

 Stercorarius (Le Stercoraire), Brisson, Orn. vi. 



pp. 149-150 (1760) PS. crepidatus. 



Leatris, linger, Prodromiis, p. 272 (1811) S. parasiticus &c. 



Labbus, Rafinesgue, Analyse, p. 72 (1815) S. crepidatus. 



Prsedatrix, Vieillot, Analyse, p. 65 (1816) S. crepidatus. 



Oceanus, Kaup, Syst. baier. Zool. p. 381 (1816) . . S. crepidatus. 

 Coprotheres, Reichenb. Av. Syst. Nat. tab. v. 



(1850), a7id Nat. Syst. Vog., Longip. p. v (1852). S. pomatorhinus. 



Banr/e. From Arctic and Sub-Arctic regions (breeding) to South 

 Africa and New Zealand in winter. 



Key to the Species. 



a. Larger, wing over 14 inches ; central rectrlces 



broad, rounded at the ends, projecting 4 



inches in the adult, and twisted vertically . . pomatorhinus, p. 322. 



b. Smaller, wing under 14 inches ; central rectrices 



pointed and tapering. 

 a'. Larger ; bill comparatively long ; shafts of 



primaries chiefly white ; central rectrices 



not projecting more than 3 inches crejndatus, p. 327. 



b'. Smaller ; biU comparatively short ; only the 



two outer primaries with white shafts; 



central rectrices projecting up to 9 inches . parasiticus, p. 334. 



1. Stercorarius pomatorhinus. 



Le Stercoraire rayi5, Brisson, Orn. vi. p. 152, pi. xiii. fig. 2 



(1760 : jr.). 

 Larus keeask (partim), Latham, Ind. Orn. p. 818 (1790). 

 Larus crepidatus (partim), Bonn. Enc. Meth. i. p. 86 (1793). 

 Larus parasiticus {nee Linn.), Wolf ^ Meyer, Naturg. Vog. Deutschl. 



ii. Heft 21, p. 70, cum fig. (1805) •, Met/er ^ Wolf, Tasch. d. Vog. 



ii. p. 490, descrip. p. 492" (1810). 



