STERNA. 45 
minal bar; lower rump and upper tail-coverts plum- 
beous-gray, the longer feathers tipped with buff; rec- 
trices pale bluish gray, the feathers becoming dusky 
subterminally ; lower parts, except as described, white; 
maxilla dusky, mandible light reddish (brownish in 
dried skins), the terminal third or fourth dusky; legs 
and feet light reddish. Length 13.25-15.00, wing 
9.75-10.75, tail 6.50-7.00 (forked for 2.40-3.75), culmen 
1.25-1.40, depth of bill at base .38, tarsus, .60-.75, 
middle toe .80-.85. Hggs 1.69 x 1.12, similar to those 
of S. paradisea, but averaging rather deeper in ground- 
color, with larger markings. Hab. Eastern Aleutian 
Islands and northward along coast to or beyond 
Norton Sound. 
73. S. aleutica Barrp. Aleutian Tern. 
c’, Mantle and six to ten middle tail-feathers slaty or blackish. (Subgenus 
Haliplana WAGLER.) 
ad. Adult: Upper parts, including hind-neck, continuously uniform 
sooty black, the outer pair of tail-feathers chiefly white; fore- 
head, sides of head, and entire lower parts white, sometimes 
faintly tinged with bluish gray posteriorly; bill and feet deep 
black. Young: Entirely dark sooty brown, more grayish on 
lower parts, the anal region and under wing-coverts white; 
scapulars and wing-coverts narrowly but distinctly tipped with 
white. Downy young: “ Head, neck, throat, and entire upper 
parts, dark gray with a silvery tinge, closely dotted with gray- 
ish white; rest of under parts white.” (Drezsser.) Length 
15.00-17.00, wing 12.00, tail 7.00-7.50 (forked for about 3.00- 
3.50), culmen 1.80, tarsus 1.00. Hyggs (deposited on rocks or 
ground, usually without nest) 2.02 x 1. 40, white, creamy white, 
or cream-color spotted with rich chestnut, usually mixed with 
fainter spots of purplish gray. Hab. Tropical and subtropical 
sea-coasts of both hemispheres; in North America, north to 
the Carolinas and western Mexico, casually to New England. 
75. S. fuliginosa Gurt. Sooty Tern. 
d@. Adult: Lower hind-neck and upper back grayish white, deepening 
into brownish slate on wings, etc., and deep black on top of 
head; forehead, sides of head, and entire lower parts pure 
white; two outer pairs of tail-feathers white; bill and feet 
black. Young: Entire lower parts, with cheeks, forehead, and 
sides of crown, white, as in adult; nape, occiput, and middle 
of crown brownish dusky; the last streaked with grayish 
white; upper parts grayish brown; the scapulars, interscapu- 
Jars, and tertials margined teuntihally with grayish white. 
Length about 14.00-15.00, wing 10.50, tail 6. 00-7.00, culmen 
