Diablomomys dalquesti is an extinct genus of omymyid primate that lived in Wyoming, United States during the Middle Eocene epoch.

Artist's reconstruction of the two species described in the paper—Mytonius williamsae (L) and Diablomomys dalquesti (R)—in Big Bend country in West Texas 44 million years ago in the middle Eocene. The volcano on the skyline is a reminder of the active volcanism that was occurring in this part of Texas during the Eocene and Oligocene epochs. Image: Randwulph. Credit: University of Texas at Austin