74 



U.S. NATIONAL MUSEUM BULLETIN 2 75 



Figure 5. — Statistical comparison of length of nasals of the species of the genus Gerbillus: 

 A, G. amoenus: B, G. aureus; C, G. campestris; D, G. eatoni; E, G. gerbillus; F, G. henleyi; 

 (',. (.'. kaiseri; H, G. pyramidum. For explanation of graphs see Plan of Treatment, p. 62. 



