782 SYSTEMATIC SYNOPSIS. —LONGIPENNES— TUBINARES. 
longest, 3d nearly equal, 1st longer than 4th. The general plumbeous or bluish-ashy cast 
of the plumage is quite different from the sooty shade of C. melcena, approaching the condition 
seen in species of Oceanodroma. Length about 7.25 ; wing about 5.00 ; tail 3.25, forked 0.60 ; 
tarsus 0.90; middle toe and claw the same; bill 0.50; gape 
0.75; height or width at base 0.20; nasal tubes 0.24. Faral- 
lone Islands, Cala. ; another rare and little known species. 
328. OCEANO'DROMA. (Gr. 'QKfavos, Okeanos, Lat. Oceanus, 
the divinity of the sea; 8po/xof, dromos, running.) Gray 
Fork-tail Petrels. Bill small, weak, much compressed. 
Wings short; 2d and 3d primaries equal and longest, 1st shorter 
than 4th. Tail long, deeply forked, with broad medium and 
narrow external feathers. Feet as in Cymochorea. Colora- yig. 526. — Black Petrel, nat. 
tion pecuhar; bluish or grayish, and white. size. (Ad nat. del. E. c.) 
826. O. furca'ta. (Lat. furcata, forked.) Gray Fork-tailed Petrel. Bluish -ash, paler 
or whitish below and on the greater wing-coverts, dusky about the eyes; lesser wing-coverts 
sooty ; quills and tail brownish, the primaries pale or white on their inner edges, outer web 
of outer tail-feather white ; bill and feet black. Length about 8.00; wing 6.00; tail 4.00, 
deeply forked; bill 0.60; tarsus 0.87; middle toe and claw the same. N. Pacific coast, 
common. 
827. O. liorn'byi. (To Admiral Hornby, R. N.) Hornby's Fork-tailed Petrel. Front, 
cheeks, throat, collar round neck, breast, and abdomen, pure white; crown, hind head, a broad 
band in front of neck, bend of wing and lesser wing-coverts, sooty -gray ; upper part of back 
gray ; lower part of back, and tail ashy-gray ; greater wing-coverts brownish-gray ; tertiaries 
and quills black. Length 8.25 ; tail 3.75; tarsus 1.00; middle toe about the same; bill along 
culmen 0.60; along rictus 0.90. N. W. coast. I have never seen this rare species, of which 
there are not to my knowledge any specimens in this country. 
329. OCEANI'TES. (Gr. 'QKeavi-rrjs, Okeanites, son of the sea.) Wilsonian Stormy Petrels. 
Very different from any of the foregoing stormy" petrels in great length of the legs, like 
stilts. Bill short, weak, compressed, not i as long as head, about f the tarsus, with sides 
a little concave, hook small, and nasal tubes perfectly horizontal. Wings very long, 2d 
primary much the longest; 1st and 3d about equal; 4th much shorter. Tail moderate, about 
square (as in Procellarid) ; ample, with feathers broad to their very tips. Tibia denuded an 
inch or more. Tarsi presenting the character, remarkable if not unique among water birds, 
of being covered in front and on sides by a continuous plate or "boot," as in a thrush, the 
ordinary scutella being fused. Toes, though long, only about f the greatly lengthened tarsi ; 
hind toe so minute as to be liable to be overlooked. Claws broad, fiat, obtuse. There are 
several species of this notable genus. 
828. O. ocea'nieus. (Lat. oceanicus, oceanic.) Wilson's Stormy Petrel. Coloration much 
as in P. peJagica or C. leucorrJioa ; dark sooty-brown, pale gray on the wiug-coverts, black 
on wings and tail; the upper tail-coverts, and frequently the crissum and sides of rump and 
base of tail, white; bill and feet black, but webs with a yellow spot; iris brown. Length 
7.00-8.00; extent about 16.00; wing about 6.00; tail 3.00, nearly even; tibia bare 1.00; 
tarsus 1.30; middle toe and claw 1.10; bill 0.50. One of the commonest and best known 
species, widely dispersed over the globe; said to breed on our N. Atlantic coast. Nest in 
burrows in the ground; egg single, white. 
330. FREGET'TA. (Ital. fregata, a frigate.) Stilt Stormy Petrels. Eesembling Oceanites 
in the great length of leg, flat obtuse claws, and other characters. Bill stout, about as high 
as broad at base, half as long as head, with long high nasal tube. Wings moderately long, 
folding just beyond the tail; 2d primary longest; 3d nearly equal; 1st between 3d and 4th. 
Tail ample, square, with broad feathers, square-tipped. Tibiye bare an inch or more ; tarsus 
