The cryptic chipmunks have a body length of 115~158mm and a tail length of 85~130mm. The tail hair is longer and the end of the tail is tapered. The palm of the forefoot is bare, with 2 palm pads and 3 finger pads; There are 2 plantar pads, the lateral ones are slightly larger, and 5 toe pads.

The chip rat has 4 fingers on the front foot, 5 toes on the hind foot, and claws Hooked. The ear shell is obvious, the ear length is 9~16mm; the front part of the orbit is wide and flat, the supraorbital process is located in the posterior part of the interorbital part, and the width of the orbit is 11~13.2mm. The female chip rat has 3 pairs of nipples and 1 pair of abdomen.