Clerarcha grammatistis is a moth in the Xyloryctidae family. It was described by Meyrick in 1890. It is found in Australia, where it has been recorded from Western Australia. The wingspan is 21-26 mm. The forewings are ochreous-grey, irregularly and suffusedly irrorated with white and with a black longitudinal dash beneath the costa near the base, as well as a small white spot in the disc at two-fifths, followed and often preceded by small suffused spots of black scales, and a small blackish suffused spot on the fold rather obliquely before this. There is a small transverse whitish spot in the disc at two-thirds, posteriorly suffusedly margined with black, and followed by some scattered black scales. There is also an indistinct cloudy whitish line from the costa beyond the middle very obli