202 Mr. 0. Thomas on 



Dimensions of the type (taken in flesh) : — 



Head and body 195 mm. ; tail 126 ; hind foot 29; ear 16. 



Skull : condylo-basal length 41'5 ; basilar length 37*2 ; 

 greatest breadth 25; nasals 11*2 x5'6; interorlDital con- 

 striction 4*8 ; palatal foramina 7 ; length of upper molar 

 series (crowns) d'6, (alveoli) 10*1. 



External dimensions of Mr. Woosnam's specimen (mea- 

 sured in flesh) : — 



Head and body 174 mm.; tail 136; hind foot 33; ear 16. 



Ilab. Armenia and ISl.W. Persia, on plateau. Type from 

 Van, 5000'. 



Type. Adult male. B.M. no. 97. 6. 4. 10. Original 

 number 17. Collected 23rd December, 1896, and presented 

 by Major W. H. Williams, E.A. 



I can find no evidence that the peculiar rounded character 

 of the molar spaces, as contrasted with their normal angular 

 condition in the type of persicus and the Caspian Sea 

 specimen no. 110, is due either to sex, age, or individual 

 variation, and it therefore seems advisable to give a special 

 name to the specimens that show it in spite of their resem- 

 blance to the lowland examples in other respects. 



14. Microtus sp. 



c?. 121. Elburz Mts., near Demavend. 4000'. 

 A small species of the M. arvalis group. 



15. Cervus elaplius, L. 

 Young?. 122. Elburz Mts., neir Demavend. 5000'. 



XXX. — A Subdivision of the Old Genus Nesokia, 7in(h 

 Descriptions of Three new Members of the Group, and of a 

 Mus//-om the Andamans. By Oldfield Thomas. 



The genus Nesokia contains three such very distinct and 

 natural groups that in accordance with modern ideas they 

 should be recognized as distinct genera. Their respective 

 characters have already been described by Anderson, Blanford, 

 and myself, but the most tangible may be briefly recapitulated 

 as follows : — 



