Description: Wings checkered dull orange to bright orange with black lines and smudges, 28 - 42 mm (1.1 - 1.65 in.) wingspan. Body with greatly reduced front legs. Although the larval host plant has not been determined, current research indicates rabbitbrush (Chrysothamnus spp.) may be used. Flight season from May to July.
Diet: Nectar host plants observed include Nevada sunflower (Heliomeris [Viguiera] multiflora).
Habitat: Primarily found in riparian areas, mixed conifer and pinyon-juniper habitat, also found in sagebrush. Its habitat requirements are poorly understood. Elevation: 1,780 - 3,050 m (5,840 - 10,000 ft).
Range: Endemic to the Spring Mountains. Primarily known from Kyle Canyon and Deer Creek; also the north side of Mount Stirling and north side of Mount Potosi.
Comments: This species was previously known as Charidryas acastus robustus.