Gelechia sematica is a moth of the Gelechiidae family. It is found in Namibia and South Africa. The wingspan is about 12 mm. The forewings are pale greyish-ochreous closely irrorated with dark fuscous, and tinged with purplish-grey. There are four small blackish spots on the costa between the base and two-thirds, each accompanied beneath by a small ochreous spot. Some blackish suffusion is found towards the base of the dorsum and there are four small spots of raised pale ochreous scales towards the dorsum between one-third and the tornus, as well as some blackishsuffusion in the disc about one-third. The stigmata are obscure, blackish, the plical rather before the first discal, both discal accompanied by small raised ochreous spots. There is a transverse rounded-triangular purple-blackish