(syn. Psephotellus Ϯ Mulga Parrot P. varius) Matthew Symonds Clark (1839-1920) English aviculturalist, ornithologist, emigrated to Australia in 1850, founder member of SAOA; L. suffix -ona relating to; "PSEPHOTUS Gould ... In this genus I also include Psephotus varius Clark, but there are some slight differences as follows: the bill is more projecting with the tip sharper: the wing has a similar formula, but the differences in length are noticeable, thus the second, third and fourth are almost equal, while the first is very little longer than the fifth. The tail is proportionately longer, well exceeding the length of the wing. The style of coloration is different and I suggest that osteological examination will cause the generic separation of these two species. In order to draw attention to this matter I propose to introduce the new subgeneric name CLARKONA for Psephotus varius Clark." (Mathews 1917).