Fig. 153. — Mule Deer. Cariacus macrotis. × 1⁄15. (From Nature.) MSW3 gives this as a synonym of Odocoileus hemionus.
Date 1902
Source The Cambridge Natural History, Volume X—Mammalia.
Author Frank E Beddard
Source: https://commons.wikimedia.org/wiki/File:Cambridge_Natural_History_Mammalia_Fig_153.png

The mule deer (Odocoileus hemionus) is a deer indigenous to western North America; it is named for its ears, which are large like those of the mule.