54h Mr. J. C. McLean on some 
will be necessary to have a series of winter specimens of 
the latter species from the lowlands of the North Island 
before one can point out the differences between that form 
and the highland form now under consideration. 
The various New Zealand forms of this genus which have 
been described, or which have to be considered, are as 
follows :— 
1. PsrupoGeryGone FLAVIVENTRIS (G. R. Gray). 
Gerygone flaviventris G. R. Gray, Voy. Ereb. & Terror, 
Birds, p. 5, pl. iv. fig. 1 (1844). 
Gerygone assimilis Buller, Essay Orn. N.Z. p. 9, footnote 
(1865). 
Gerygone aucklandica Pelz. Reise Novara, Vog. p. 65 
(1865). 
Type. Adult. Bay of Islands, north of North Island 
(Lieut. A. Smith): Voyage of the ‘ Erebus’ and ‘ Terror.’ 
Adult male (breeding-plumage). Jris crimson. Above dark 
olive-brown, with a more olive tinge on the lower back 
and rump; an indistinct grey superciliary stripe; Jores, 
cheeks, and underparts grey; axillaries and middle of the 
belly whitish, tinged with yellowish on the flanks and under 
tail-coverts. 
In his original description Gray writes: “ front, throat, 
and breast greyish-white”; but this is a mistake, for the 
forehead is olive-brown like the rest of the head. 
The British Museum possesses six examples of P. flavi- 
ventris including the type specimen. 
Through the kindness of Dr. Lorenz I have been 
permitted to examine the type of G. aucklandica Pelz., 
and I have no doubt that it is an immature example of 
P. flaviventris. 
Ty pe of G'. aucklandica. Immature. Near Auckland, north 
of North Island, 5th January. 
Immature. Tris umber-brown. Above greyish-brown washed 
with olive; breast grey, the sides washed with olive; throat, 
belly, under wing- and tail-coverts almost white. 
