Polyhymno subaequalis is a moth of the Gelechiidae family. It was described by Walsingham in 1911. It is found in Mexico (Guerrero). The wingspan is about 16 mm. The forewings are shining bronzy brown, with a broad white median streak from the base, attenuated to a point beyond the end of the cell where it nearly coalesces with a small elongate white spot beneath its apex, which is succeeded by a white triangular patch before the termen. The lower angle of this is produced in a narrow marginal line along the base of the dorsal cilia, its upper angle also produced towards the apex, but shortly meeting, at an acute angle, two white costal lines, the one starting nearly from the base and leaving the costa beyond the middle, the other coming from the costa a little beyond it, and only slightly