We describe a new genus and species of Saprininae: Paraeuspilotus monte n. gen., n. sp., which was captured in pitfall traps and in burrows of the native mouse Ctenomys mendocinus Philippi, 1869, commonly named tuco-tuco (Rodentia: Ctenomyidae). Paraeuspilotus monte was registered in the Monte biogeographic province, in Mendoza, Argentina. Figures of adult, and details of some external and internal morphological structures and genitalia of both sexes are provided. The biology and association with C. mendocinus are discussed.