What is "dipus aegyptius"

Jerboa \Jer*bo"a\, n. [Ar. yarb[=u]`.] (Zo["o]l.) Any small jumping rodent of the genus Dipus, esp. Dipus [AE]gyptius, which is common in Egypt and the adjacent countries. The jerboas have very long hind legs and a long tail. [Written also gerboa.]

Note: The name is also applied to other small jumping rodents, as the Pedetes Caffer, of the Cape of Good Hope.

Jerboa kangaroo (Zo["o]l.), small Australian kangaroo ( Bettongia penicillata), about the size of a common hare.