490 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
S[terna] trudeawi Gray, Gen. Birds, iii, 1846, 659.—Covuus, Key N. Am. Birds, 
2d ed., 1884, 767.—Ripeway, Man. N. Am. Birds, 1887, 41. 
[Sterna] trudeaut PexzEtn, Orn. Bras., 1870, 461.—Covzs, Key N. Am. Birds, 
1872, 322.—SHarrz, Hand-list, i, 1899, 137. 
Sterna trudeauii AupuzBoN, Birds Am., 8vo. ed., vii, 1844, 105, pl. 485.—Grravp, 
Birds Long Island, 1844, 354.—LawreEncg, in Baird, Rep. Pacific R. R. 
Surv., ix, 1858, 861.—Barrp, Cat. N. Am. Birds, 1859, no. 687.—ScLaTzeR 
and Satvin, Proc. Zool. Soc. Lond., 1871, 570 (monogr.).—OrTon, Am. 
Nat., iv, 1871, 716 (Audubon’s type said to be in coll. Mus. Vassar College).— 
SauNnpDERS, 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)—Durnrorp, Ibis, 1877, 200 (Province of Buenos 
Aires, Argentina).—Taczanowskl, Orn. du Pérou, iii, 1886, 443.—ScLatTER 
and Hupson, Argentine Orn., ii, 1888, 195.—Hox.anp, Ibis, 1890, 428 (near 
Ranchos, Argentina; descr. nest and eggs); 1892, 212 (Estancia Espartilla, 
Argentina; habits; descr. eggs).—HoimBrre, Segundo censo Argentina, 
1898, 558.—IneRine, Revista Mus. Paulista, iii, 1899, 446 (Sio Paulo, s. 
Brazil)—Harrerr and VentuRI, Novit. Zool., xvi, 1909, 253 (Barracas al 
Sud, San Martin, and Monte, Buenos Aires, Argentina, Jan., June).—Granr 
(C. H. B.), Ibis, 1911, 473 (Los Inglesas, Linconia, and Tuyu, Argentina, 
Oct.-March). 
[Sterna] trudeauii Gray, Hand-list, iii, 1871, 118, no. 11027.—Sciarer and Sarvin, 
Nom. Av. Neotr., 1873, 147.—Forszs and Rosinson, Bull. Liverp. Mus., ii, 
no. 2, 1899, 55 (Chile). 
Gelochelidon trudeaui Borg, Isis, 1844, 187. 
[Thalasseus] trudeauti Bonararte, Compt. Rend., xlii, 1856, 772. 
Phaetusa trudeauti Buasros, Journ. fiir Orn., 1866, 73 (monogr.). 
[Phaetusa] sellovii Licutenstern, Nomencl. Av. Mus. Berol., 1854, 98 (nomen 
nudum; Maldonado, Uruguay; coll. Berlin Mus.). 
Sterna frobeentti Puitipr1 and LANDBECK, Wiegmann’s Archiv fiir Naturg., 
xxix, pt. 1, 1863, 125 (Arica Bay, Chile)—Lanpsrcx, Anal. Univ. Chile, 
1872, 515. 
Sterna frobenit Puiuierr and LanpDBECK, Cat. Av. Chile., 1869, 49. 
[Sterna] frobeenti 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, 
pallid 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 well-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 
