The Diceroprocta texana species complex is currently composed of Diceroprocta texana texana (Davis, 1916) and Diceroprocta texana lata Davis, 1941. We analyzed physiological, morphological, and biogeography to determine whether these taxa in fact represent two distinct species rather than subspecies. There are statistically significant differences in morphological, acoustic, and thermal parameters as well as the biogeographic patterns of the two taxa. From these data, we suggest that the two taxa actually represent two species and that D. texana lata be elevated to species full species rank with the name Diceroprocta lata Davis, 1941 n. stat. We provide the first records of D. lata collected in the United States.