O'Keefe et al. (2000) listed 291 ant species in Texas. We visually summarized the distribution of known myrmecofauna across Texas to identify counties and ecoregions that are under-surveyed. The mean number of documented species of ants per county was 16.7 ± 15.9. Counties in the Trans-Pecos ecoregion had the greatest known myrmecofaunal diversity. Most counties in the Piney Woods and the Oak Woods and Prairies ecoregions are probably under-surveyed, and are recommended for sampling priority. This study serves as a guide for future myrmecofaunal surveying efforts and introduces a collaborative project known as the Ants of Texas (AoT).