Dipus
the jerboas, a genus of rodents, the type of the family Dipodidæ. It includes about 20 species. D. ægypticus is a native of northeastern Africa, Arabia, and southwestern Asia. It lives in burrows, and is generally gregarious. It is about six inches long, with a tail eight inches long, exclusive of the tuft at the end. Its upper surface is of a grayish sand color, the lower surface white, hite, the tail pale yellowish above, and white beneath; the tip white, with an arrow-shaped black mark on the upper surface.