Marginal orange markings on dorsal hindwing on both sexes. Metallic scales are present around the black spots. These spots are arranged in a row adjacent to the ventral hindwing margin. Shijimiaeoides battoides bernardino is somewhat similar but smaller. Male bernardino lacks orange on the dorsal hindwing, and there are no metallic scales on the ventral hindwing of bernardino specimens.
Records are generally from the lowland areas and canyons of the Santa Ana Mountains.
The Acmon Blue is rarely found at high elevations in the Santa Ana Mountains. Multiple brooded, flying from late February or March, to October. The spring and early summer broods are often the largest. In the lowlands of Orange County, particularly along the coast and at Villa Park Dam, I feel Eriogonum fasciculatum is the primary foodplant. A prostrate Lotus sp.