16 



ARKIV FÖR ZOOLOGI. BAND 10. N:0 12 



Zygomatic breadth 61,5 mm. 



Interorbital » 18 



Postorbital constriction 14,2 



Breadth of braincase 38,4 



Mastoid breadth 42,4 



Palatal length from gnathion 59 



Breadth of posterior palate 9 



Upper tooth row inoluding canine 38,7 



» molar series 30 



Greatest horizontal diameter of p* 11,6 



» » » » m^ 10,8 



» » » » m^ (worn) 6,6 



Lower molar series 33,5 



Length of m^ 9,5 



» >* m^ 5,8 



Height of bulla from bony ledge to its ventral surface . 14,0 



young 



»9» 



12 

 10,6 

 6,6 



9,5 



6,1 

 13,2 



In the year 1912 I described a Water Mungoose ^ whioh 

 I had obtained the year before at Nairobi, Brit. East Africa, 

 and I drew the attention to the fact that in several respects 

 with regard to dimensions of the skull it resembled M. p. 

 mitis and differed from M. p. rohustus. The same year Rol- 

 lister ^ named a Water Mungoose form Kilimanjaro M. p. 

 riibescens. His description of the colour of this race agrees 

 very nearly as well with the same of my specimen from 

 Nairobi as with that of the present four specimens. The 

 above recorded skull measurements are also not much differ- 

 ent from those of Hollister's type as far as the latter 

 have been published. The interorbital breadth of Hollis- 

 ter's type is not stated. Compared with my specimen from 

 Nairobi, in which this measurement is 20 mm., the specimen 

 from Donya Sabuk appears to have a rather narrow inter- 

 orbital space, but a specimen from Kilimanjaro is somewhat 

 intermediate in this respect having the measurement in ques- 

 tion 19,5 mm. The same specimen from Kilimanjaro has 

 rather large teeth viz. p^ 12,6 mm. and m^ 11,2 mm. These 

 facts prove a rather great variability of the East African 

 Water Mungooses which also extends to the colour of the fur, 

 some being more black than the others. The long, glossy, 

 overlying hairs are of different size, the longest are usually 



^ K. Vet. Akad. Handl., Bd. 48, n:o 5, p. 69. 



' Proc. Biol. Soc. Washington., Vol. XXV, 1912, p. 1. 



