Cuscomys is a genus of rodents found in the Andes of Cusco in southern Peru. These relatively large chinchilla rats are dark grey with a distinct white line running from the crown to the nose. The genus was coined in 1999 when C. ashaninka was scientifically described, but later it was discovered that C. oblativus, a species traditionally placed in the genus Abrocoma, actually belonged in Cuscomys. They are very poorly known, as C. ashaninka only is known from the holotype, while C.