Thiotricha delacma is a moth of the Gelechiidae family. It was described by Meyrick in 1923. It is found in southern India. The wingspan is 13-15 mm. The forewings are shining white, with faint brownish-ochreous tinge and with the extreme costal edge dark fuscous, becoming a dark brown streak on the apical third, towards the apex cut by an oblique wedge-shaped white mark, followed by two white dots edged black beneath, the last terminated by a black apical dot. There is a fuscous or brownish streak along the dorsum nearly from the base, becoming wider along the termen where it includes an oblique white streak before the tornus and a white mark or dot on the termen. The hindwings are grey.