474 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
xiii, 1890, 137 (La Paz, Lower California, March).—BERLEPscH and Sroxz- 
MANN, Proc. Zool. Soc. Lond., 1892, 400 (Callao, Peru).—Loomis, Proc. 
Calif. Ac. Sci., 3rd ser., ii, 1900, 319 (Monterey Bay, California).—GRINNELL, 
Pacific Coast Avif., no. 3, 1902, 13 (California range); no. 11, 1915, 24 (Cali- 
fornia; irregular summer and fall visitant north to San Francisco Bay).— 
Satvin and Gopman, Biol. Centr.-Am., Aves, iii, 1903, 407 (Guaymas, 
Sonora; Mazatlan, Sinaloa; Isabella Island; Gulf of Tehuantepec and San 
Mateo, Oaxaca; La Union, Salvador; Bay of Fonseca, Honduras; coast of 
Chile; Corpus Christi, Texas).—Brcx, Proc. Calif. Ac. Sci., 4th ser., iii, 1910, 
64 (Monterey Bay, California, Sept., Oct., 1896)—Brewster, Bull. Mus. 
Comp. Zool., xli, no. 1, 1902, 24 (La Paz, Lower California, March 14; Mag- 
dalena Bay, common; Guaymas, Sonora, breeding). 
S[terna] elegans Ripaway, Man. N. Am. Birds, 1887, 40. 
[Sterna] elegans Gray, Hand-list, iii, 1871, 120, no. 11056.—Suarrz, Hand-list, i, 
1899, 135. —Forses and Rosrnson, Bull. Liverp. Mus., ii, no. 2, 1899, 54 
(Chile?). 
T{hallaseus] elegans GamBxEL, Journ. Ac. Nat. Sci. Phila., ser. 2, i, 1949, 228. 
[Thalasseus] elegans Bonaparte, Compt. Rend., xlii, 1856, 772. 
Thalasseus elegans Couxs, Proc. Ac. Nat. Sci. Phila., 1862, 540 (monogr.); Ibis, 
1864, 389 (Salvador).—Satvin, Ibis, 1866, 198 (Bay of Fonseca, Salvador).— 
OBERHOLSER, Auk, xxxiv, 1917, 199. 
S[terna] (T) [halasseus] elegans Couns, Key N. Am. Birds, 2d ed., 1884, 760. 
[Phaéthusa] elegans HEINE and RetcHenow, Nom. Mus. Hein. Orn., 1890, 355, 
part (Chile). 
(?) [Thalasseus] gayi Bonaparte, Compt. Rend., xlii, 1856, 772 (Chile). 
[Sterna] gayi Gray, Hand-list, iii, 1871, 119, no. 11049. 
Sterna comata Puruiprt and LaAnpBECK, Wiegmann’s Archiv fiir Naturg., xxix, 
1863, pt. 1, 126 (Chile). 
Sterna galericulata (not of Lichtenstein) Finscu, Abh. nat. Ver. Bremen, i, 1870, 
859 (Mazatlan, Sinaloa).—SciaTer and Satvin, Proc. Zool. Soc. Lond., 1871, 
568-9, part, fig. 2—Couzs, Check List, 1873, no. 563—LAWRENCE, "Mem. 
Bost. Soc. N. H., ii, 1874, 317 (Mazatlan, Sinaloa; Isabella Island). 
[Sterna] galericulata Cours, Key N. Am. Birds, 1872, 320.—SciaTER and Satvin, 
Nom. Av. Neotr., 1873, 147. 
Sterna ( Thalasseus) galenianlou Covss,, Birds Northwest, ‘1874, 671 (monogr.). 
(?) Sterna maxima (not of Boddaert?) Bamsy (H. H.), Auk, xxiii, 1906, 377 
(Isabella Island, Tepic, w. Mexico, breeding). 
THALASSEUS EURYGNATHUS (Saunders). 
CAYENNE TERN. 
Adults in breeding (2) plumage (sexes alike).—‘ Identical with the 
preceding [T. elegans] in plumage, but the bill is lemon-yellow and the 
angle of the gonys is immediately below or very little in front of the 
anterior end of the nostril; the hind parts of the tarsi, the soles, and 
the claws are dull yellow. Total length 17.5 inches [444.5 mm.], 
culmen 2.7 [68.58 mm.], wing 12.1 [307.34 mm.], tail 6.5 [165.1 mm.], 
tarsus 1.1 [27.94 mm.], middle toe and claw 1.2 [30.48 mm.].’’4 
Young.—Forehead, crown, and occiput white, the last, together 
with posterior portion of crown, streaked with dull blackish; nape 
@T have not seen an adult of this species, and therefore copy the above description 
from Saunders, Cat. Birds Brit. Mus., xxv, 1896, 85. 
