AVES. 9 



LONGIPENNES. 



STERCORARIIDAE. 



Stercorarius catarrhactes (Linne). Dresser, Birds of Europe, 

 1871-81, vol. 8, pi. [609]. Egg, Seebohm, 1896, p. 118, pi. 37, 

 figs. 3, 4. 



Pelagic; nests on rocky cliffs or tundras. 



Mass. — Rare \dsitor offshore: Georges Banks, July, 1878; 

 Nantucket Shoals, Oct. 11, 1883; Polluck Rip, Sept. 10, 1884. 



16. Stercorarius pomarinus (Temminck) Vieillot. 



Pomarine jaeger. 



Lestris pomarinus Temm., Man. d'ornith., 1815, p. 514. "les 

 regions du cercle Arctique. " Audubon, Birds of Amer., 1844, 

 vol. 7, p. 186, pi. 451. Egg, Seebohm, 1896, p. 116, pi. 37, fig. 6. 



Largely marine; nests on the ground. 



Me. — Uncommon migrant, casual in summer. INIay; (June 23, 

 24); July 14-late Oct. 



Mass. — Uncommon migrant, occasional in summer. May 23; 

 July 5-Sept. 28. 



R. I. — Uncommon migrant offshore, mainly in fall. Oct. 



17. Stercorarius parasiticus (Linne) Schaffer. 



Parasitic jaeger; Gull chaser; Marlinspike; Richardson's 

 jaeger; Robber gull; Sea hen. 



Larus parasiticus Linne, Syst. nat., ed. 10, 1758, vol. 1, p. 136. 

 "intra tropicum Cancri, Europae, A:mericae, Asiae." 



Lestris richardsonii Swains. Audubon, Birds of Amer., 1844, 

 vol. 7, p. 190, pi. 452. Egg, Seebohm, 1896, p. 116, pi. 37, figs. 1, 2. 



Largely marine; nests on the ground. 



Me. — Uncommon migrant oft'shore; casual in summer. May- 

 June; (July) Aug.-Oct. 



