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Euptoieta claudia
The upperside of the wings is checkered with orange and black. Both the forewing and hindwing have a row of submarginal black spots and black median lines running across the wings.[2][3] The underside of the forewing is orange with a pale orange spot rimmed in black in the forewing cell. The underside of the hindwing is mottled with browns and grays with a pale postmedian band. There is no silvering.[3] The wingspan measures 1.75–2.25 inches (44–57 mm).-Wikipedia.
Spotted on wildflowers near the Arkansas river.
I think this lovely butterfly is a Variegated Fritillary. The shape of the wings and color pattern look like a better match to me.
You can compare to the Great Spangled Fritillary here: https://bugguide.net/node/view/338734