96 W. T. Blanford— On tie Voles (Arvicola) of tie [No. 2, 



II. The anterior upper molar has 4> angles inside and 3 outside ; 

 the second 3 inside and 3 outside ; the anterior lower molar 

 has normally 9 spaces. — Neodon. 



A. The posterior inner angle in the two anterior upper molars 



is weaker than the other inner angles of the same tooth ; 

 the last upper molar ends with an internal projecting 

 spur; the first lower molar has 6 well-marked angles 

 inside 8. A. sikimensis. 



B. The posterior inner angle in both the anterior upper molars 



is usually equal or nearly equal to the others j the last 

 upper molar, as a rule, does not terminate with an inter- 

 nal spur ; the first lower molar has 5 well-marked angles 



inside * . . 9. A vnelanog aster. 



N.B. The differences in the molar teeth of the last two species are not constant, 

 and the distinction of the species depends on external characters. 



In the next table an attempt is made to discriminate the forms by 

 external characters : — 



I. Thumb rudimentary and clawless. 



Colour light ferruginous brown 1. A. stoliczJcanas. 



Colour light brown, with a grey tinge 2. A. stracheyi. 



II. Thumb with a small claw. 



A. Ears short, not projecting beyond the fur. 



Colour dark rich brown, lower parts light brown .... 3. A. wynnei. 

 Colour yellowish brown, with a rufous tinge ; lower 



parts buff A. A. roylei. 



Colour earthy brown; lower parts whitish 6. A. blythi. 



Colour light greyish rufescent brown (isabelline); lower 



parts white I.A. mandarinus; 



B. Ears projecting beyond the fur. 



a. Ears only projecting by about one third of their length. 



Colour dark yellowish or rufous -brown ; underparts 



slaty grey ; hind foot T % inch, ear less than f inch long 9. A. melanogaster 



b. Ears projecting by fully half their length. 



Colour dark yellowish brown ; lower parts slaty grey ; 

 hind foot f inch, ears fully J inch long ; tail one 

 third the length of the head and body 8. A. siJcimensis. 



Colour light greyish rufescent brown; ears nearly 

 | inch long; tail half the length of the head 

 and body 5. A. blanfordi. 



Section I. Alticola. 



The first lower molar with, normally, 7 spaces, 4 or 5 external and 5 inter- 

 nal angles ; the first upper molar with 5 spaces, 3 inner and 3 outer 

 angles ; the second with 4 spaces, 3 outer and 2 inner angles ; the 

 third terminating in an elongate lobe, produced backwards in the line 

 of the jaw. 



