Frick : New Abyssinian Rodents. 



19 



other genera) ; sides lighter and divided from pallid mouse-gray of 

 under parts by a bright buffy line; slate-gray fur of ventral surface 

 evenly tipped with pure white; tail slightly darker above than below, 

 annulations prominent (13 per 10 mm.) and but slightly haired; feet 

 and toes white-furred. 



Color of dorsal area of series of nine specimens (Nos. 44 cf', 86 d^, 

 37 9 . 55 cf , 53 9 , 313 cf , 83 cf , 80 9 , and 89, juv.) varies from drab- 

 gray in a specimen from Tertale to vinaceous-buff in one from Black 

 Abai Lake. 



The collection includes a specimen (No. 7520) from Addis Ababa, 

 which differs from the specimens described above, and corresponds 

 with Peter's description of E. hildebranti (typicus) in the strong 

 "ochre color" of its under parts, the white of same being heavily 

 washed with buff along the sides and mid-ventral line. This specimen 

 also differs from E. gardulensis in having heavier fur and in the excep- 

 tional blackness of its dorsal area. Tails of specimens from Addis 

 and Tertale are much the shortest of the series, and the only specimens 

 in which tails measure less than the combined length of head and body. 



Measurements. 



No. 44 cf 



(Type), 



mm. 



No. 37 9, 



Black Abai, 



mm. 



No. 7520 cf, No. 313 cf , 

 Addis, Tertale, 



No. 7S2icf, 



Ankober, 



mm. 



Length of head and body 



Length of tail 



Length of pes 



Greatest length of skull. . . . 



Basilar length 



Condylo-incisive length .... 



Zygomatic breadth 



Interorbital breadth 



Squamosal breadth 



Length of nasals 



Breadth of nasals 



Length of diastema 



Alveolar length of upper 



tooth-row 



Length of palatal foramen. . 



Depth of brain-case 



Depth of maxillary at f ronto- 



!► nasal suture 



Length of mandible 



120. 

 120. 



25- 



33-3 

 26.6 



31-4 



4.6 



13- 



12.6 

 3-4 

 8.5 



5.6 

 7.6 

 9- 



7.6 

 17.6 



112. 



113- 



24-5 



32.5 



26.1 



30.4 



15-5 



4.4 



12. 1 



12.9 



3-5 



8.6 



5-4 



7- 



8.5 



7-5 

 17.6 



131- 



107. 

 24-5 

 31.6 

 26. 

 30.1 



4.6 



12.4 



12.6 



3-3 



8.6 



5-1 

 7-7 

 9-3 



7-4 

 17-5 



I 5. 

 07. 

 23-5 

 30.6 

 23-9 

 28.5 

 14.1 



4.4 

 12.2 

 12.6 



3-1 



5-1 

 7-1 

 8.5 



7. 

 16.5 



133- 



154. 

 28 ? 



34-9 

 28.1 



32.5 

 16.4 

 4.9 

 13.6 

 14.1 



4- 

 9.4 



6.3 

 7-5 

 9.1 



7.6 

 19.1 



Genus Arvicanthis. Lesson. 

 Three distinct forms of Arvicanthis abyssinictis Riippell, taken in 

 widely separated localities, Chilalo (altitude 9,000 feet), Sadi Malka 



