We present here the results of a study of leaf litter ant diversity in remnant areas of semi-deciduous seasonal forests in the Atlantic Forest biome. Standardized collections were made in 2011, using pitfall traps and Winkler sacks in two fragments of native forest in the municipality of Barra do Choça in the micro-region of the Planalto da Conquista, in southwestern of the state of Bahia, Brazil. A total of 107 species from 37 ant genera and 9 subfamilies was collected. The observed richness was high, and the diversity indices (Shannon-Wiener) of the two fragments suggest that in spite of being strongly impacted by anthropogenic actions, they maintained high faunal diversity levels, similar to those observed in other original Atlantic Forest sites in state of Bahia. Analyses of the species accumulation curves (Jackknife 2), however, indicated that survey effort was not sufficient to capture all of the species present. The high observed numbers of unique species, the shape of the species accumulation curves, and high values of estimated richness suggest that the survey areas were quite heterogeneous. These results provide new information concerning regional biodiversity that will be useful for continuing studies on fragmentation processes in the region.