About Colias alexandra Edwards, 1863
This species, Colias alexandra, has a wingspan ranging from 38 to 57 mm. Males are similar above to Colias philodice, but have a glossier yellow base color with an orange-yellow tint, particularly on the hindwing. The underside of the wings is very distinct in both sexes: the hindwing is silver grey with a silvery median spot. Females are light yellow, with either a small dark distal margin on the forewing or no dark distal margin at all, and always have a black median spot. Some female individuals are fully suffused with orange yellow.
