PROCELLARIIDJE. 55 



parts, forehead, tips of longer 

 scapulars and of tail white; wing 



about 8.00 Halobwna} 



P. Depth 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. 

 A". 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.. Meijaquem." 

 h-. Space between nasal tubes and base of unguis 

 decidedly greater than length of the latter; 

 . nostrils partlj" (usually entirely) visible from 

 above ; color and size xcvy variable, but wing 

 never more than 15.00 (usuallj- much less). 



Puffinus. (Page 58.) 

 /'. Bill flattened, broader than deep at base. 



Branches of lower mandible bowed widelj- 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. 

 /'. Culmen concave ; lateral outlines of bill straight. 



Pseudoprion} 

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



Prion? 



<P. 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... Pagodroma.* 



' Halohwna " Is. Geoffb. IS.'ie," BoNAP. Consp. ii. 1857, 193. Type, Procellaria cxrulea GsiEU 

 » Cookiiana BosAP., Compt. Rend, xliii. 1856, 994. Type, Procellnrin cootii Gray. 

 ' Mnjnqueut Reich., Av. Syst. 1852, p. iv. Type, Procellnrin ifqiiinoclinlia LlKX. 



♦ Ptendoprinn Coi-E."!, Pr. Ac. Nat. Sci. Phil. 1866, 164. Type, Prion lurtur Gould. 



» Prion Lac£p£de, Mfm. de I'Inst. 1800-1801, 514. Type, Procellaria villala Ghel. 



• Pagodroma BoSAP., Consp. ii. 1856, 192. Type, Proctllaria nicca GuEL. 



