Miacora perplexa is a moth in the Cossidae family. It is found in North America, where it has been recorded from Colorado and western Texas to California and Oregon. The habitat consists of montane areas. The length of the forewings is 17–21 mm for males and 20–24 mm for females. The forewings are grey with brown shading along the base and inner margin. There are dark transverse lines that form a double Y shape. The hindwings are uniform pale grey. Adults have been recorded on wing from May to September.