This is a very problematic identification.
The most likely alternative is that the above is a Little Sulphur, like the one just below, on the right

Mimosa Yellow                               Little Sulphur

Eurema nise                                                         Eurema lisa

But to my eye, they just are not the same. The E. nise is not a normal resident in Houston County and is at most a stray from south Texas. The USGS site has documented it from the latitude of Houston County, but to the west about 100 miles.

Other images of the Mimosa Yellow can be found here, and others of the Little Sulphur are here.

You can see a comparison of the E. nise with other local sulphurs/yellows here.

Photograph taken with a Nikon D80, using a Nikon 200mm, f/4 micro manual focus lens.

July 14, 2007.