60 NORTH AMERICAN BIRDS. 
fi. Tarsus 1.70, or more. 
g. Tail-3.10, or less. 
Above uniform sooty blackish, the head and 
neck not perceptibly paler ; lower tail-coverts 
mixed white and dusky, in greatly varying 
relative amount; length 13.00-15.00, wing 
8.50-9.25, tail 2.60-3.10, culmen 1.35-1.40, 
depth of bill at base .40-.45, tarsus 1.70-1.80, 
middle toe 1.65-1.70. Downy young: Sooty 
brownish gray above, grayish white below. 
Egg 2.36 X 1.62. Hab. Northern Atlantic 
(chiefly the eastern side) and Mediterranean 
Sea....seceee 90. P. puffinus (Brinn.). Manx 
Shearwater. 
g. Tail 3.25, or more. 
Above uniform sooty slate, appreciably paler on 
head and neck; lower tail-coverts wholly sooty 
grayish; length 12.25-15.00, wing 9.00-9.10, 
tail 3.25-3.80, culmen 1.30-1.42, depth of bill 
at base .35-.42, tarsus 1.75-1.85, middle toe 
1.68-1.75. Egg 1.79 1.27. Hab. Pacific 
coast, from Lower California to British 
Columbia...... 98. P. opisthomelas Covuzs. 
Black-vented Shearwater. 
f?. Tarsus 1.65, or less. 
g. Lower tail-coverts with more or less of dusky. 
#. Above uniform sooty black; white of under side 
of head extending upward nearly or quite to 
the eye, sometimes involving part of the lores ; 
length about 11.00, wing 7.60-8.40, tail 3.50, 
culmen 1.20-1.25, depth of bill at base .35, 
tarsus 1.50-1.65, middle toe 1.45-1.60. Egg 
2.05 X 145. Hab. Warmer parts of Atlantic 
Ocean, north, casually, to toast of New Jer- 
sey..... 92. P. auduboni Finscu. Audubon’s 
Shearwater. 
}’, Similar in color to P. auduboni, but sides of neck 
and breast slaty, the feathers with white mar- 
gins; wing 7.20-7.80, tail 2.95-3.25, culmen 
.98-1.05, tarsus 1.40-1.45, middle toe, with 
claw, 1.52-1.60. Hab. Pacific Ocean? (“ King 
George’s Sound”), west to the Seychelles. 
P. tenebrosus PELz. Pelzeln’s Shearwater.? 
1 Lataam (“ Synopsis,” iii. pt. ii. p. 417) says “King George’s Sound, on the American coast”; but von 
PELZELN (Ibis, 1873, p. 47) thinks that this isa mistake, King Georgo’s Sound on the west coast of Australia 
being meant instead. 2 Pufinue tenebrosus PExz, Ibis, 1873, 47. 
