438 Messrs. G. M. Matliews and Tom Iredale: 



Maorigerygone igata flaviventris (Gray). North Island Grey 

 Warbler. 



Gerygone flaviventris Gray, Voy. ' Erebus ' and ' Terror/ 

 Birds, 1844, p. 5, pi. iv. fig. 1 : Bay of Islands, North 

 Island. 



Synonyms : — 



Gerygont assimilis Buller, Essay Oj'uith. New Zeal. 1865, p. 9, 



footnote : proposed on nest only : North Island. 

 Geri/ffone aucklandica Pelzeln, Reise Novara, Vogel, 1805, p. 65 : 



Auckland, North Island. 

 PseiidoyerygoneJiariveJitris Buller, Supj)!. vol. ii. p. 117 Tpart.). 



Bange : — North Island, breeding in the Lo\vlands. 



Maorigerygone igata rnacleani (Grant), North Island 

 Mountain Warbler. 



Pseudogerygone rnacleani Grant, Ibis, 1907, p. 545 : 

 North-eastern portion of North Island, 2000 feet. 



Bange: — North-eastern North Island (breeding, 2000 feet). 



Note: — In the Ibis, 1907, pp. 542-54G, Grant wrote upon 

 the New Zealand forms of the genus P seudo gerygone and 

 admitted as distinct species the four we have here included, 

 but which we consider subspecies only. 



It is obvious that the plumage changes which this species 

 undergoes are not yet clearly understood, and Grant^s key on 

 p. 54G confuses the breeding, winter, and immature plumages, 

 and does not correctly define the differential characteristics 

 of the forms. Much more material is necessary before these 

 can be considered fixed, as Grant himself admits ijoc. cit. 

 pp. 543-4). 



There is, however, little doubt that the Alpine heights of 

 the south-west of the South Island harbour a distinct form 

 from the Lowlands and these forms can carry the names 

 here used. The North Island lowland form also appears to 

 have a mountain representative in Grant's P. rnacleani. 

 From Grant's paper it is obvious that the forms are so close 

 that they can be considered as subspecies only and an 

 examination of a series confirms that conclusion. 



