Hellinsia auster is a moth of the Pterophoridae family that is found in the U.S. state of Arizona (including the type location, Mohave County). The wingspan is 20–27 millimetres (0.79–1.06 in). The head is blackish-brown, white between antennae, which are dark with a white line above, sometimes broken into dots. The thorax is whitish, although the scales are lightly tipped with grey-brown, more heavily in a band which crosses the thorax. The abdomen is grey brown with a few white scales. Above it is marked with two white stripes which contain a pair of diverging black streaks on each segment. In the posterior half of the abdomen, the bases of each pair of streaks are connected by a broad dorsal dash in the posterior margin of the preceding segment. There are also some blackish lateral dash