Meridarchis caementaria is a moth in the Carposinidae family. It was described by Meyrick in 1911. It is found on the Seychelles (Aldabra). This species has a wingspan of 13mm. The head is whithish-ochreous sprinkled with grey. The forewings are pale greyish ochreous sprinkled with grey and blackish, more whitish-ochreous on margins; seven small spots of blackish irroration on the costa, two in disc at 2/5 and 2/3, one on submedian fold before tornus and several along termen.