90 Bailey — New Species mid Subspecies of Voles. 



jecting farther back than in pinetorvm ; palate often with a posterior point 

 projecting into the TJ-shaped interpterygoid fossa; molar series long; 

 third upper molar with three tightly closed triangles and an irregular 

 posterior loop; first lower molar with opposite reentrant angles meeting 

 behind the anterior loop. 



Measure merits.— Type specimen: Total length 130; tail vertebrae 24; 

 hind foot 18. Average of five females and five males from type locality: 

 Total length 135; tail vertebrae 25 ; hind foot 18.1. Skull of type: Basal 

 length 25.3; nasals 7.7: zygomatic breadth 16.5; mastoid breadth 13.4; 

 alveolar length of upper molar series 7. 



Microtus pinetorum auricularis subsp. now 



Type from Washington. Miss., No. |f£f|, ^ ad., U. S. Nat. Mus., Biolog- 

 ical Survey Coll. Collected May 26, 1892, by Vernon Bailey. Orig. No. 

 3649. 



General characters. — Size small, about equalling pinetorum; ears very 

 large for a Pitymys and conspicuous above fur ; colors dark and rich ; fur 

 short and dense like that of pinetorum. 



Color. — Upper parts dark rich chestnut darkened by dusky tipped hairs ; 

 under parts washed with paler chestnut over dark under fur; projecting 

 tip of ear with scattered dusky hairs ; tail not bicolor, scarcely darker 

 above, like the back or slightly darker; feet dull brownish. 



Cranial charactt rs. — Skull like that of pirn torum in general form and char- 

 acters, hut interpterygoid fossa normally U-shaped instead of V-shaped; 

 third upper molar with three closed triangles : first lower molar with first 

 pair of reentrant angles meeting behind anterior loop. 



Measurement. — Type: Total length 120; tail vertebrae 22 ; hind foot 16. 

 Skull of type: Basal length 22.3 ; nasals 7 : zygomatic breadth 15.2; mas- 

 toid breadth 12.3 ; alveolar length of molar series 6. 



