Protorthodes eureka

Protorthodes eureka is a moth in the Noctuidae family. It is found from southern Alberta southward in the western Great Plains to Colorado and in the Great Basin to east-central California and south-western Colorado. The habitat consists of open xeric habitats, especially sagebrush prairie and open pinyon-juniper woodlands.

The length of the forewings is 11–13 mm. The forewings are reddish brown with a longitudinally-streaked pattern resulting from dark-colored veins and lighter-brown colour between the veins. There is a series of black sagittate spots on the inner side of the (almost straight) subterminal line. The hindwings are pale whitish grey with a grey marginal band with an indistinct medial margin. The veins are dark. Adults are on wing from early August to late September.