LARUS. 35 
¥ 
rump, upper tail-coverts, and tail, uniform pure white, more or less rose- 
tinted in breeding season; mantle some shade of gray.) 
6. Tarsus much longer than middle toe, with claw. 
Summer adult : Head sooty slate-color; mantle plumbeous-slate; five 
outer primaries entirely black, or sometimes with a small terminal 
spot of white; rest of quills plumbeous, tipped with white, the sixth 
sometimes with a subterminal black spot; bill and feet (in life) 
dark brownish red. Winter adult: Head and neck white, the oc- 
ciput and ear-coverts spotted or mottled with brownish gray, the 
eyes more or less surrounded by the same; otherwise as in summer. 
Young : Head, neck, breast, and sides nearly uniform brownish gray, 
darker on occiput.and hind-neck, tinged with buff beneath; mantle 
grayish brown, the feathers broadly bordered with pale grayish buff; 
centre of rump light brownish gray; rest of rump, with upper tail- 
coverts and posterior lower parts, white; basal half of tail light 
gray, subterminal portion black, the tip narrowly white. Downy 
young: Above grayish fulvous, varying to umber-brown, the head 
irregularly striped or spotted, the back, wings, and rump marbled, 
with dusky ; lower parts paler, the breast and belly more ochreous, 
the fore-neck, sides, flanks, and ventral region faintly mottled with 
darker. Length 15.00-17.00, wing 13.00, tail 5.00, culmen 1.75, tarsus 
2.00, middle toe, with claw, 1.50. Eggs 2.18 x 1.55. Had. Atlantic 
coast of United States, south, in winter, through West Indies and 
along both coasts of Middle America, and as far as the lower Ama- 
BON. sedeneiicviveracivanuecunueenees 58. L. atricilla Linn. Laughing Gull, 
b%. Tarsus not longer than middle toe, with claw. 
ce’, Wing more than 10.00; culmen more than 1.00. 
d@', Bill brownish or reddish, its depth through the angle more than 
one-fourth the culmen. Summer adult: Bill bright red (in life), 
with more or less distinct darker subterminal band; head deep 
plumbeous-black, with a white spot on each eyelid; mantle deep 
plumbeous; quills bluish gray, the shafts white, all broadly 
tipped with white, and the five outer ones marked with a sub- 
terminal space of black; lower parts deeply tinted (in fresh 
specimens) with rose-pink, and middle tail-feather tinged with 
pearl-gray. Winter adult: Similar, but head white, the occi- 
put, region round eyes, and ear-coverts, grayish dusky ; bill and 
feet duller red. Young: Top and sides of head (except forehead 
and lores), with back and scapulars, grayish brown, the longer 
scapulars bordered terminally with pale grayish buff; quills 
dusky (inner webs more plumbeous), tipped with white; centre 
of rump bluish gray; rest of rump, with upper tail-coverts, 
entire lower parts, forehead, lores, and eyelids, white. Length 
13.50-15.00, wing 11.25, culmen 1.30, depth of bill at nostrils .35, 
tarsus 1.60, middle toe, with claw, 1.60. Hggs 2.11 x 1.53. Hab. 
