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 l . 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,} 

 c l . Lower parts white. 



d 1 . Wing more than 12.00. 



e 1 . 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. 

 f 1 . Lower tail-coverts entirely white. 



g l . 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. SCHLEG. Mus. P.-B., Pro- 

 cellarice, 1863, p. 24). 



P. kuhlii (BoiE). Cinereous Shearwater. 1 

 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. 

 /*. 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 .6S-.75, tarsus 2.05-2.12, 

 middle toe 2.15-2.40. Hab. Eastern Pacific Ocean 

 from California to Chili. 



91. P. creatopus COTJES. Pink-footed Shearwater. 



e 1 . 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. Hab. 



Atlantic Ocean generally. 



89. P. major FABER. Greater Shearwater. 

 d*. Wing less than 10.00. 



e l . Above sooty slate, without white tips to wing-coverts, etc. 



1 For references, see A. 0. U. Check List, p. 350. 



