The sexes appear to present no difference in the colour of their plumage; but the female, as is the case with the other members of the genus, is considerably smaller than her mate. Crown of the head and all the upper surface bright olive-yellow, approaching to grey on the back; lores black; ear-coverts, throat and under surface pale yellowish grey, faintly striated with a darker tint; behind the ear two tufts, the upper of which is narrow and black; the lower, which is more spread over the sides of the neck, of a beautiful yellow; primaries and tail-feathers brown, margined with bright olive-yellow; irides very dark reddish brown; bill black; legs and feet apple-green. The figures are male and female of the natural size, on one of the Acacias of Western Australia. [Illustration: PTILOTIS FLAVESCENS: _Gould_. _J. Gould and H. C. Richter del et lith._ _Hullmandel & Walton Imp._ ] PTILOTIS FLAVESCENS, _Gould_. Yellow-tinted Honey-eater. _Ptilotis flavescens_, Gould in Proc. of Zool. Soc., Part VII. p. 144. The only example of this new species that I have seen is from the north coast of Australia, where it was procured and subsequently presented to me by my friend Benjamin Bynoe, Esq., late of Her Majesty’s Surveying Ship the Beagle. It differs from all the other members of its genus in the uniform yellow colouring of its plumage, for which reason I have assigned to it the specific appellation of _flavescens_,—a term indicative of the colouring by which it may be readily distinguished from its congeners. I regret to say that nothing whatever is at present known of its habits or economy. Head and all the under surface delicate citron-yellow, the yellow prevailing over the head; immediately under the ear-coverts a spot of blackish brown, posterior to which is a spot of bright yellow; the remainder of the plumage olive-grey. The figures are of the natural size. [Illustration: PTILOTIS FLAVA: _Gould_. _J. Gould and H. C. Richter del et lith._ _Hullmandel & Walton Imp._ ] PTILOTIS FLAVA, _Gould_. Yellow Honey-eater. _Ptilotis flava_, Gould in Proc. of Zool. Soc., Part X. p. 136.