PROCELARIIDJE. 55 



parts, forehead, tips of longer 

 scapulars and of tail white; wing 



about 8.00 Halohcena} 



i^. Dej)th of bill at shallowest part decidedly 

 less than one-fourth the length of the 

 lower mandible, measured along its side ; 

 plumage bluish gray above, becoming 

 white on forehead and blackish on wings ; 

 beneath entirely white ; wing about 



9.00 Cookilaria} 



g^. Partition between nostrils very thick (as wide as or 

 wider than nostril), ending anteriorly "flush" 

 with, or but little behind, the anterior rim" of the 

 nasal tubes. 

 h}. Space between nasal tubes and base of unguis not 

 greater than length of the latter ; nostrils not 

 visible from above ; color uniform sooty black 

 (browner below), with or without white mark- 

 ings on head ; wing 13.50 or more.. Majaqueus? 

 h?. Space between nasal tubes and base of unguis 

 decidedly greater than length of the latter; 

 nostrils partly (usually entirely) visible from 

 above ; color and size very variable, but wing 

 never more than 15.00 (usually much less). 



Puffinus. (Page 58.) 

 p. Bill flattened, broader than deep at base. 



Branches of lower mandible bowed widely apart, the 

 space between mostly unfeathered ; plumage spotted 

 white and dusky above, entirely white beneath. 



Daption. (Page 69.) 

 e\ Inner side of edge of upper mandible with distinct fringe-like 

 processes ; color bluish above, the tail tipped with black- 

 ish ; beneath white ; wing about 7.00-7.50, 

 p. Culmen concave ; lateral outlines of bill straight. 



Pseudojprion} 

 p. Culmen straight ; lateral outlines of bill decidedly convex. 



Prion.} 



d}. Culmen less than half as long as middle toe, with claw; tail 



even ; hind claw very large, equal in length to the nasal tubes, 



measured along the top ; color entirely pure white... Fagodroma.^ 



1 Halohstna " Is. Geoffr. 1836," Bonap. Consp. ii. 1857, 193. Type, Procellaria cierulea Gmel. 



2 Cookilaria BoNAP., Compt. Rend, xliii. 1856, 994. Type, Procellaria cooJcii Gray. 



3 Maj'aqtieus Reich., Av. Syst. 1852, p, iv. Type, Procellaria sequinoctialis Linn. 

 * Psetidoprion CouES, Pr. Ac. Nat. Sci. Phil. 1866, 164. Type, Prion titrtur Gould. 



5 Prion Lacepede, Mem. de I'lnst. 1800-1801, 514. Type, Procellaria, vittata Gmel. 

 ^ Pagodroma BoNAP., Consp. ii. 1856, 192. Type, Procellaria nivea Gmel. 



