PUFFINUS. 59 
a’. Nostrils completely visible from above, the nasal tubes depressed and bevelled 
anteriorly, where narrower than at base; under wing-coverts white, or else 
lower parts also dusky. 
b'. Tail much less than half the wing, slightly rounded, or moderately gradu- 
ated (the graduation not more than two-thirds the length of the tarsus). 
(Subgenus Puffinus.) 
ce. Lower parts white. 
d', Wing more than 12.00. 
e. No distinct line of demarcation between white of throat, etc., 
and smoky gray of top and sides of head and neck; bill 
yellowish ; above brownish gray, feathers of back, etc., 
tipped with paler; sides of head and neck transversely 
undulated with ash-gray and white. 
J’. Lower tail-coverts entirely white. 
g. Length about 18.00, wing 13.00-14.00, culmen 1.80- 
2.00, depth of bill through base .65-.70, tarsus 1.85- 
2.00, middle toe 2.10-2.25. Downy young: Uni- 
form sooty grayish brown. Hab. Middle eastern 
Atlantic; a specimen from Greenland said to be 
in Leyden Museum (cf. Scutec. Mus. P.-B., Pro- 
cellarie, 1863, p. 24). 
P. kublii (Borz), Cinereous Shearwater.! 
g. Length about 20.00-22.00, wing 13.75-14.50, culmen 
2.10-2.25, depth of bill at base .75-.80, tarsus 2.20- 
2.25, middle toe 2.45. Hab. Western North At- 
lantic (off coast of Massachusetts). 
88. P. borealis Cory. Cory’s Shearwater. 
f?. Lower tail-coverts uniform dark sooty grayish. 
Length 19.00, wing 12.50-13.25, culmen 1.60-1.70, 
depth of bill through base .65-.75, tarsus 2.05-2.12, 
middle toe 2.15-2.40. Hab. Eastern Pacific Ocean 
from California to Chili. 
91. P. creatopus Couns. Pink-footed Shearwater. 
é&. White of throat, etc., separated very abruptly from the dusky 
color of top and sides of head and neck; bill blackish. 
Above smoky grayish brown, feathers of back, etc., with 
paler tips; longer upper tail-coverts mostly white; 
belly more or less clouded with smoky gray, the flanks 
and lower tail-coverts mostly grayish brown; length 
19.00-20.00, wing 11.50-13.00, culmen 1.80-1.85. Had. 
Atlantic Ocean generally. 
89. P, major Faner. Greater Shearwater. 
d?, Wing less than 10.00. 
é. Above sooty slate, without white tips to wing-coverts, etc. 
1 For references, see A. 0. U. Check List, p. 350. 
