Silvery Checkerspot (Chlosyne nycteis) 
This butterfly looks a lot like the pearl crescent and can be easily identified as a pearl crescent if the observer is not careful.  This species is larger than a pearl crescent and has a lot more black near the tips of the wings.
Sillvery Checkerspot
Walter Jacobs Nature Park, Caddo Parish, April 16, 2005.
Sillvery Checkerspot
Walter Jacobs Nature Park, Caddo Parish, April 16, 2005. 
Silvery Checkerspot
Acadian Nature Park, Lafayette, LA, May 19, 2014.  This caterpillar is feending on Ambrosia_trifida (giant ragweed).