The maternally vertical transmitted bacterial reproductive parasite Wolbachia occurs in ~50% of all arthropods including the pillbug Armadillidium vulgare. In some pillbugs, Wolbachia feminizes genetic male offspring into functioning anatomical females. A second feminizing phenomenon is a nuclear insert called the f-element. We will be the first to determine the frequency of thes two sex ratio distorter distribution in A. vulgare across the United States.