Idiophantis croconota is a moth of the Gelechiidae family. It was described by Meyrick in 1918. It is found in Madagascar.
The wingspan is about 14 mm. The forewings are fuscous with a rather broad light ochreous-yellow dorsal stripe throughout, the edge broadly prominent about two-thirds, where it reaches half across the wing, narrowed towards the tornus. There is a curved dark grey line from four-fifths of the costa to the tornus, edged anteriorly by a light greyish line becoming stronger and white towards the costa, preceded towards the costa by an obscure ochreous dark-edged line. The area beyond this is light ochreous-yellow, marked on the upper part of the tornal prominence with a dark bronzy spot containing a round black dot, the apical projection suffused grey and containing a white longitudinal mark. The hindwings are grey, lighter anteriorly.