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 Idiurus zenkeri is an old *adult female 

 i "' cm sehr altes W-eibchen "), while the two specimens of 1. macrotis 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 Idiurus should occur in the Came- 

 roon district is not at all improbable. Neither can it he' 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 " Entfernnng der inneren Rander der beiden Reihen." 



