676 . BULLETIN 50, UNITED STATES NATIOXAL MU?EUM. 



b. Axillars and under wing-coverts grayish brown, slightly tinged with cinnamon- 

 rufous; under parts more grayish brown than rufescent. (Northern part of 



North Atlantic Ocean.) Megalestris skua (p. 677). 



bb. Axillars and under wing-coverts mostly cinnamon or cinnamon-rufous; under 

 parts uniform dull cinnamon-rufous or cinnamon. (Both coasts of southern 

 South America, from Rio de Janeiro on Atlantic side to Callao, Peru, on 



Pacific side.) Megalestris chilensis (extralimital).« 



aa. Bill relatively shorter and deeper, with anterior edge of supra-nasal saddle (viewed 



from above) slightly concave; under parts sooty brown to buffy brown (not at 



all rufescent). 



b. Under parts dark sooty brown; neck not conspicuously, if at all, streaked with 



yellow; white patch on base of primaries smaller. (Falkland Islands, South 



Georgia Island, Gough Island, Straits of Magellan, and adjacent seas. 



Megalestris antarcticus (extralimital).^ 



3. Megalestris cMIensis. (Catharacta chilensis Mathews, Birds Australia, ii, pt. 



5, Jan. .31, 1913, 496.— West coast of South America.) 



4. Megalestris maccormicki maccormicki. (Catharacta maccormichi maccormicki 



Mathews, Birds Australia, ii, pt. 5, Jan. 31, 1913, 496. — South Victoria Land.) 



5. Megalestris maccormicki wilsoni. (Catharacta maccormicki wilsoni Mathews, 



Birds Australia, ii, pt. 5, Jan. 31, 1913, 495, 496.— Weddell Sea.) 



6. Megalestris lonnbergi lonnbergi. (Catharacta antarctica lonnhergi Mathews, 



No^-it. Zool., xviii, 1912, 212; New Zealand seas. — Catharacta lonnbergi lonn- 

 bergi Mathews, Birds Australia, ii, pt. 5, Jan. 31, 1916, 484, 494, 496.— 

 Megalestris antarctica (not Lestris antarcticus Lesson) Mathews, Birds Aus- 

 tralia, ii, 1913, pi. [122] facing p. 484. — Australian and New Zealand seas, 

 breeding on Chatham Islands and Antarctic islands of New Zealand.) 



7. Megalestris lonnbergi intercedens. (Catharacta lonnbergi intercedens M&the-ws, 



Birds Australia, ii, pt. 5, Jan. 31, 1913, 496.— Kerguelen Island.) 



8. Megalestris lonnbergi clarkei. (Catharacta lonnbergi clarkei Mathews, Birds 



Australia, ii, pt. 5, Jan. 31, 1913, 494, 496.— South Orkney Islands.) 

 Of these forms I have seen only the first, third, and seventh. 



o [Stercorarius antarcticus} b. chilensis Bonaparte, Consp. Gen. Av., ii, 1857, 207 

 (South America; coll. Berlin Mus.). — Stercorarius chilensis Saunders, Proc. Zool. Soc. 

 Lend., 1876, 323, pi. 24 (monogr.); 1877, 800 (Straits of Magellan); Cat. Birds Brit. 

 Mus., XXV, 1896, 3L8. — M[egalest.ris] chilensis Ridgway, Man. N. Am. Birds, 1887, 21. — 

 Catharacta chilensis Mathews, Birds Australia, ii, pt. 5, Jan. 31, 1913, 496. 



^Lestris antarcticus Lesson, Traite d'Orn., 1831, 616 (Falkland Islands). — Ster- 

 corarius antarcticus Gray, List Birds Brit. Mus., Anseres, 1844, 167; Saunders, Proc. 

 Zool. Soc. Lond., 1876, 321, part (monogr.). — Catarracta antarctica Bonaparte, Nau- 

 mannia, 1854, 210. — Catarrhactes antarcticus Bruch, Journ. fiir Orn., 1853, 108. — 

 Catharacta antarctica Lonnberg, Kungl. Svensk. Vet. Handl., Bd. 40, no. 5, 1906, 58 

 (South Georgia Island; crit., habits, etc.). — Megalestris antarcticus Gould, Proc. Zool. 

 Soc. Lond., 1859, 98 (Falkland Islands). — Megalestris antarctica Saunders, Cat. Birds 

 Brit. Mus., XXV, 1896, 319, part (Inaccessible Island, oil" Tristan da Cunha; Falkland 

 Islands). — Megalestris skua antarctica (not of Baird, Brewer, and Ridgway, 1884.) 

 Mathews, Birds Australia, ii, 1913, 496 (Falkland Islands, breeding; Gough Island). — 

 Buphagus antarcticus Coues, Proc. Ac. Nat. Sci. Phila., 1863, 127 (monogr.); Birds 

 Northwest, 1874, 604, part (monogr.). — Lestris antarctica Sclater and Salvin, Ibis, 

 1869, 284 (Santa Magdalena, Straits of Magellan). — Megalestris skua falklandica Lonn- 

 berg, Schwed. Sud. Exped., Bd. v, Lfg. 5, 1905, 8. 



