Hellinsia perditus is a moth of the Pterophoridae family. It is found in California and Colorado. The wingspan is 19–25 mm. The head is dark brown, but yellowish white between the antennae. These are dark with a slender line of whitish above. The thorax is pale yellowish white. The abdomen is similar to the thorax, but with some grey scales and a faint brown dorsal stripe. The costa of the forewings is yellowish, sometimes obscured toward the base. Just inside of this line, the wing is brownish grey, becoming gradually paler toward the inner margin with an increasing admixture of whitish scales. The veins are sometimes darker in the second lobe. The fringes are brownish grey with paler bases but yellowish on the costa. The hindwings and their fringes are brownish grey.