FIG. 5. Three species of jack-rabbits, differing in size, color, and markings, but 

 believed to be derived from a common stock. The differences have arisen 

 through isolation and adaptation. The upper figure shows the head and fore le_"S 

 of the black jack-rabbit (Lepus insularis), of Espiritu Santo Island, Gulf of 

 California ; the lower right-hand figure, the Arizona jack-rabbit (Lepus alleni), 

 specimen from Fort Lowell, Arizona ; and the lower left-hand figure is the San 

 Pedro Martir jack-rabbit (Lepus martirensis), from San Pedro Martir, Baja 

 California. 



