Regal fritillary

Species of butterfly

The regal fritillary is a striking nymphalid butterfly found among some of the remaining tallgrass and mixed-grass prairies in the east-central United States. This prairie-specialist butterfly has a characteristic deep orange color and unmistakable dark hindwings with two bands of spots. On the female, both bands of spots are white. However, on the male, the outer band of spots is orange in color. Females also tend to be slightly larger than males. The ventral surface of the hindwings is olive brown to black in color with bold silvery white spots. The wingspan of S. idalia usually measures 68–105 millimetres (2.7–4.1 in). Flight is in the summertime from approximately June to September and adults tend to be swift in flight, coasting close to the ground. It is listed as a species of special concern and believed extirpated in the US state of Connecticut.

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