BIRDS OF NORTH AND MIDDLE AMERICA. 641 
AX [ema] atricilia CaBants, in Schomburgk’s Reis. Brit. Guiana, iii, 1848, 761. 
Larus ridibundus (not of Linnzeus) Witson, Am. Orn., ix, 1814, 89, pl. 74, fig. 4.— 
Bonaparte, Ann. Lyc. N. Y., ii, 1828, 358, footnote —L#oraup, Ois. Trini- 
dad, 1866, 532. 
L{arus] ridibundus Bonaparte, Obs. Nom. Wilson’s Am. Orn., 1826, [213]. 
Larus plumbiceps (not of Temminck) Breum, Lehrb., 1824, 722, part. 
Xema wilsonii Bors, Isis, 1828, 358 (St. Croix, Greater Antilles). 
Larus atricapillus [lapsus?] ABBort, Proc. Bost. Soc. N. H., i, 1842, 61. 
[Atricilla] macroptera Bonaparte, Naumannia, 1854, 212 (South America; nomen 
nudum). 
[Atricilla] minor Bonaparte, Naumannia, 1854, 212 (Antilles; nomen nudum). 
[Atricilla] catesbaei Bonararte, Naumannia, 1854, 212 (w. North America; nomen 
nudum); Compt. Rend., xlii, 1856, 771. 
Atricilla catesbet Locus, Expl. Sci. Algér., Ois., ii, 1867, 189. 
[Atricilla] catesbyi Bruca, Journ. fiir Orn., 1855, 287 (“‘Warmere Nordamerika’’).— 
Heine and ReicHenow, Nom. Mus. Hein. Orn., 1890, 359. 
[Larus (Atricilla)] megalopterus Brucu, Journ. fiir Orn., 1855, 287 (Peru; Mexico). 
Larus atricilla megalopterus Nosuz, Bull. Mus. Comp. Zool., lx, Aug., 1916, 367 
in text (coast U. S.; crit.). 
(Larus (Atricilla)] micropterus Brucu, Journ. fiir Orn., 1855, 288 (s. parts of North 
America), 
CHROICOCEPHALUS FRANKLINII (Swainson and Richardson). 
FRANELIN’S GULL. 
Adults in summer (sexes alike).—Head and upper portion of neck 
plain slate-blackish or dusky purplish gray, more slaty anteriorly; 
an elongated white spot on each eyelid; lower neck (all round), 
entire under parts, lower rump, and upper tail-coverts immaculate 
white, the neck and under parts more or less deeply suffused with 
eosine pink, especially in living or recently killed specimens; back, 
scapulars, wings, and upper part of rump uniform neutral gray, the 
tertials and secondaries broadly tipped with white; five outer pri- 
maries with a subterminal space of black, varying in extent from 
about 50 mm. on the second (from outside) to about 12.5 mm. on the 
fifth, and tipped with white, these white tips varying in extent from 
about 38 mm. on the outermost to less than 12 mm. on the rest, the 
gray of basal portion on all becoming white or nearly so distally, 
next to the black subterminal area, the shafts white except within 
the latter; remaining (proximal) primaries lighter gray, broadly, 
but not abruptly, tipped with white, the sixth (from outside) some- 
times with a subterminal bar or spot of black; tail white, the four to 
six middle rectrices tinged with pale gray, especially the middle 
pair; bill deep red with a more or less distinct subterminal band of 
darker red; iris dark brown; naked orbital ring, legs, and feet, deep 
red. 
Adults in winter—Similar to summer adults but head and whole 
neck white, the occipital, auricular, and orbital regions dusky grayish; 
bill and feet darker red, the former tipped with. orange-reddish. 
40017—19—Bull. 50, pt 8——42 
