This genus was created by Oates for the reception of Xanthixus flavescens, a species differing from all its nearest allies in having the tail-feathers strongly graduated. The outermost tail-feather Mis short of the longest by a distance equal in length to the tarsus; the crest resembles that of Hemixus flavala and the wing that of Molpastes.
There is only one species, which I divided into two races in 1917, one of which was again renamed by Kloss in 1919 on the grounds that I had renamed the original race from Arrakan instead of the new race. I have again compared the fine series in the British Museum and find that my original distribution is quite correct. Kloss's name sordidus therefore becomes a synonym of my vividus. The types of flavescens from Arrakan, which are in the Indian Museum and were inspected by Kloss, are probably discoloured by age, as fresh specimens from Arrakan and the Chin Hills show beyond all doubt that they belong to the same form as that from Assam and not to the more yellow form from Eastern Burma.
Kloss's birds from Anuam may quite possibly be yet. another form, though I cannot distinguish any differences, in which case they would retain the name sordidus.
Key to Subspecies.
A. Below paler, grey of abdomen slightly suffused (cens, p. 392.
with yellow not extending to breast X. flavescens flaxes-
B. Below darker on breast and flanks and yellow
extending to breast or even to throat X. fl. vividus, p. 393.