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Chlosyne ehrenbergii
Most Chlosyne species have a Fritillary / Checkerspot type of pattern on both wing surfaces, but ehrenbergii is black on both wing surfaces, marked with radiating creamy lines, which are more prominent on the underside of the wings.
This species is found mainly in scrubby situations, including along roadsides.
My girlfriend spotted this butterfly on her morning commute and then helped it flutter off (probably to an important meeting).