OF THE UNITED STATES 



421 



we are still quite ignorant of much that pertains to their natural 

 history, and the young naturalists of this country can employ 

 their time in no better way than to make personal observations 

 upon the habits of these and other representatives of our mam- 



FIG. 112. THE JUMPING MOUSE (Z. hudsonius). 



Adult male . 



malian fauna, recording every fact noted that may in any man- 

 ner increase our knowledge of their biology in any one of its de- 

 partments. 



Several years ago when 1 wrote about the Jumping mice of this 

 country, Zapus hudsonius, the Jumping mouse was the sole spe- 



