I am not positive about the identification of this butterfly, but my best guess is this is a Eufala Skipper (Lerodea eufala) at Walker Ranch Park in northern San Antonio. There are several other very similarly-marked butterflies, (especially when worn), so it could also be a Cloudy Skipper, a Fawn-Spotted Skipper, Julia's Skipper, Liris Skipper or even a Whirlabout.