76 



Miller Description of a New Rodent. 



and about equal to premolar. Enamel pattern essentially as in the max- 

 llary teeth, but less regular. 



General remarks. The type of Jdiurus zenkeri is an old adult female 

 ("eiu sehr altes Weibchen "), while the two specimens of 1. mucrotin are 

 males, one young adult, the other old. Yet the differences between the 

 two forms are too great to be ascribed to sexual variation. That two or 

 more species of a genus so peculiar as Idiunis should occur in the Came 

 roon district is not at all improbable. Neither can it be wondered at 

 that animals so perfectly protected by color and form (the general appear 

 ance is well shown in Mr. Matschie's figure) should successfully escape 

 notice, especially if, as is probably the case, they are strictly nocturnal in 

 habits. 



Measurements of Idiurus macrotis and I. zenkeri. 



* By ' Ohr ' Mr. Matschie may mean ear from crown. 

 t " Entfernung der inneren Riinder der beiden Reihen." 



