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concealed by antrorse latero-frontal plumules. Rictal bristles distinct, though soft and short, 
not reaching beyond anterior end of nasal fossa, Wing long, rather pointed; fourth and filth 
primaries longest, sixth but little shorter, though conspicuously longer than third; second 
falling between eighth and ninth; first primary well developed, broad, much more than half as 
long as second, Tail much shorter than wing, graduated, rectrices somewhat pointed at tip, 
with the shafts stiffened and distinctly projecting. Tarsus robust, very long, much longer than 
middle toe with claw; acrotarsium scutellate, the scutes, however, often fused into a single 
lamina, the divisions being obliterated. Toes long, outer and middle toes equal in length, and 
conspicuously longer than inner toe; outer toe adherent to middle toe for its entire basal 
phalanx; hallux about equal to outer toe or slightly longer, but much stouter; claws robust, 
strongly curved, especially that of hallux, which is scarcely shorter than the digit. Wing 80-84, 
tail 62-70, tarsus 25-28, bill about 13 mm. 
Coloration. Sexes alike. Plumage soft and copious. Head all round, foreneck, breast 
and abdomen bright Jemon-yellow, sides and flanks dull olive-brownish; under tail coverts 
dingy white, with dusky bases. Back, ramp and upper tail coverts dull greenish olive-brown. 
Wings dusky, edged with olive-brown. Tail dull greenish olive, paler beneath, with shafts 
above reddish brown, below whitish. Bill black. Feet brown. The young birds differ from the 
adult ones in having the yellow portions of the plumage duller, and the head above obscured 
by dusky olive edges to the feathers. 
Geographical Distribution. New Zealand. 
Observations. The systematic position of this bird is still very uncertain. In structural 
characters, it shows a great likeness to the Australian genus Orthom\x, commonly referred to 
the Timeliidac, and I should not be surprised if it would ultimately prove to belong to this 
group rather than to the Paridae. From the latter it very markedly differs by its very long, 
thick tarsus, the proportion of the toes and by having the shafts of the rectrices stiffened and 
projecting. 
1. Mohoua ochrocephala (Gmelin). (PI. 3, Fig. 6 ) 
Muscicapa ochrocephala Gmelin, Syst. Nat. Vol. 1, u, p. 944 (1789) (based on « Yellow-headed Flycatcher », Latham, 
Gen. Syn. Birds, Vol. 2,1, p. 342 : « Queen Charlotte’s Sound, in New Zeeland »). 
Certhia heteroclites Quoy & Gaimard, Voyage Astrolabe, Vol. 1, p. 223, Ois. pl. 17, f. 1 (1830) («habite la baie 
Tasman »). 
Mohoua hua Lesson, Compl. Oevr. Buffon, Vol. 9, p. 139 (1837) (Nouvelle-Zélande). 
Orthonyx icterocephalus Lafresnaye, Rev. Zool. Vol. 2, p. 257 (1839) («in insulis les Marquises dictis », errore!). 
Parus heteroclytus Lafresnaye, Mag. Zool. Cl. 2, Ois. pl. 8 (1839) (Nouvelle-Zélande). 
Musicapa chloris Forster, Descr. Anim. Austr. p. 87 (1844) («in insula australi Nove Zeelandiz »). 
Fig. Buller, Hist. Birds New Zeal., ed. 2, Vol. 1, 1887, pl. 6. 
Hab. South Island of New Zealand. 
23. GENUS CERTHIPARUS LAFRESNAYE 
Certhiparus Lafresnaye, Rev. Zool. Vol. 5, p. 69 (1842) (sp. typ. : Parus senilis Dubus). 
Certhioparus Agassiz, Nomencl. Zool., Index, p. 75 (1846) (nom. emend.). 
Phyllodytes (nec Wagler 1830, Amphibia!) Finsch, Journ. f. Ornith. Vol. 21, p. 397 (1873) (nom. 
emend. pro Certhiparus Lafresnaye). 
