490 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



S[terna] trudeaui Gray, Gen. Birds, iii, 1846, 659. — Coues, Key N. Am. Birds, 

 2d ed., 1884, 767.— Ridgway, Man. N. Am. Birds, 1887, 41. 



[Sterna] trudeaui Pelzeln, Orn. Bras., 1870, 461. — Coues, Key N. Am. Birds, 

 1872, 322.— Sharpe, Hand-list, i, 1899, 137. 



Sterna trudeauii Audubon, Birds Am., 8vo. ed., vii, 1844, 105, pi. 435. — Giraud, 

 Birds Long Island, 1844, 354. ^Lawrence, in Baird, Rep. Pacific R. R. 

 Surv., ix, 1858, 861.— Baird, Cat. N. Am. Birds, 1859, no. 687.— Sclater 

 and Salvin, Proc. Zool. Soc. Lond., 1871, 570 (monogr.). — Orton, Am. 

 Nat., iv, 1871, 716 (Audubon's type said to be in coll. Mus. Vassar College). — 

 Saunders, Proc. Zool. Soc. Lond., 1876, 660 (monogr.); 1891, 373 (Argentina; 

 descr. eggs); Cat. Birds Brit. Mus., xxv, 1896, 130 (Rio de Janeiro and Santa 

 Catarina, Brazil; Maldonado, Uruguay; Punta Lara, Buenos Aires, and 

 Ajo, Argentina; Chile). — Durnford, Ibis, 1877, 200 (Province of Buenos 

 Aires, Argentina). — Taczanowski, Orn. du Perou, iii, 1886, 443.— Sclater 

 and Hudson, Argentine Orn., ii, 1888, 195. — Holland, Ibis, 1890, 428 (near 

 Ranchos, Argentina; descr. nest and eggs); 1892, 212 (Estancia Espartilla, 

 Argentina; habits; descr. eggs). — Holmberg, Segundo censo Argentina, 

 1898, 558. — Ihering, Revista Mus. Paulista, iii, 1899, 446 (Sao Paulo, s. 

 Brazil). — Hartert and Venturi, Novit. Zool., xvi, 1909, 253 (Barracas al 

 Sud, San Martin, and Monte, Buenos Aires, Argentina, Jan., June). — Grant 

 (C. H. B.), Ibis, 1911, 473 (Los Inglesas, Linconia, and Tuyu, Argentina, 

 Oct. -March). 



[Sterna] trudeauii Gray, Hand-list, iii, 1871, 118, no. 11027.— Sclater and Salvin, 

 Nom. Av. Neotr., 1873, 147. — Forbes and Robinson, Bull. Liverp. Mus., ii, 

 no. 2, 1899, 55 (Chile). 



Gelochelidon trudeaui Boie, Isis, 1844, 187. 



[Thalasseus] trudeaui Bonaparte, Compt. Rend., xlii, 1856, 772. 



Phaetusa trudeauii Blasius, Journ. fiir Orn., 1866, 73 (monogr.). 



[Phaetusa] sellovii Lichtenstein, Nomencl. Av. Mus. Berol., 1854, 98 (nomen 

 nudum; Maldonado, Uruguay; coll. Berlin Mus.). 



Sterna frobeenii 'Pnihippi and Landbeck, Wiegmann's Archiv fiir Naturg., 

 xxix, pt. 1, 1863, 125 (Arica Bay, Chile).— Landbeck, Anal. Univ. Chile, 

 1872, 515. 



Sterna frobeni Philippi and Landbeck, Cat. Av. Chile., 1869, 49. 



[Sterna] frobeenii Gray, Hand-list, iii, 1871, 118, no. 11032. 



(?) [Phaethusa] chloropoda (not Sterna chloropoda Vieillot) Heine and Reichenow, 

 Nom. Mus. Hein. Orn., 1890, 355 (Chile). 



STERNA FORSTERI Nuttall. 



FORSTER'S TERN. 



Adults in summer (sexes alike). — Pileum and nape uniform black; 

 rest of upper parts, including rump, upper tail-coverts, and tail, 

 paUid neutral gray, the primaries with a velvety surface, especially 

 in unworn plumage; inner webs of elongated outermost rectrices 

 darker (sometimes quite dusky) terminally, the outer webs white; 

 inner webs of primaries without any weU-defined white space, except 

 on two outermost, the remaining quills usually with edge of inner 

 web more or less dusky; tips of secondaries, anterior upper tail- 

 coverts, lateral and under portions of head and neck, and entire 

 under parts, including axillars and under wing-coverts, immaculate 

 white; bill dull orange, with terminal third (more or less) black or 



