62 



MICROTIN^ 



old age in the interorbital region; the post-orbital processes of 

 the squamosals are prominent and peg-like, but the squamosals 



Fig. 35. — Microtus hartingi Barrett -Hamilton. 



Dorsal, ventral, and lateral views of subadult skull, enlarged ; the small 

 figure shows the skull in dorsal view, natural size. 



do not appear to approach each other or to encroach upon the 

 frontals with advancing age. The palate is normal; the 



