Hellinsia costatus is a moth of the Pterophoridae family. It is found in North America, including California, Utah and British Columbia. The wingspan is 30–33 mm. The head is pale greyish-yellow, but paler between the antennae. The antennae and palpi are more whitish, the latter with a dark streak on the outside of the third joint and tip of the second. The thorax and abdomen are pale greyish yellow, the latter with a faint brown dorsal line. The forewings are yellowish-white, shaded with grey and becoming darker and more brownish in the costal region. The fringes are mostly concolorous. The hindwings and their fringes are brownish grey.