606 Messrs. G. M. Mathews and T. Iredale on some 



youDg of P. neglecta. In coloration P. cervicalis is absolutely 

 constant, while P. neglecta shows remarkable variation in 

 coloration. Again, the egg-shell of P. cervicalis is peculiar 

 when contrasted with that of P. neglecta. Such details may 

 not impress the genus-lumper, but it is as well that they 

 should be recorded in this connection with the suggestion 

 that P. cervicalis and P. neglecta are representatives of 

 distinct genera. We have already noted that Cookilaria is 

 very distinct in all the above factors. 



Cookilaria cookii hypoleuca. 



(Estrelata hypoleuca Salvin, Ibis, 1888, p. 359: Krusen- 

 stern Island, Marshall Group. 



''North Iwojima, Bonin Is., February 1910. (Estrelata 

 hypoleuca Salv.^^ Full data in Japanese. 



Culmen 26, wing 230, tail 120, tarsus 32, mid-toe 32 mm. 



Differs from the type of (E. hypoleuca Salvin, which 

 measures : culmen 26, wing 228, tail 120, tarsus 29, mid- 

 toe 29 mm., only in having the feathers of the rump darker. 



" Sagalien Is., April 1909. (Estrelata hypoleuca Salv.'^ 

 Also data in Japanese. 



Culmen 25 5, wing 236, tail 114, tarsus 30, mid-toe 

 30 mm. Agrees absolutely with the preceding. 



These are practically typical specimens, so that it is almost 

 certain that the Sandwich Island birds require a new name: 

 no form of this genus is known to inhabit different localities, 

 those from east Australia, Kermadec Islands, New Zealand, 

 and Chatham Islands respectively being all well characterised. 



Genus Bilweria. 



Bulweria Bonaparte, Nuov. Annal. Sci. Nat. Bologna, 

 vol. viii, for 18J2, Jan. 1843, p. 426. 



Type (by mouotypy): Procellaria bulweri Jardine & 

 Selby. 



So much has been written abont this very distinct genus 

 that we can add nothing. In the ' Monograph ' it is placed 

 after Pagodroma nivea (Gmelin), as anatomical study has 

 proved it to be very aberrant in some features considered 



