New Species and Subspecies of Voles. 80 



base of incisors : audita! bulla? small ; incisive foramina short ; first u ] > po r 

 molar usually with a posterior lobe on inner side; molar pattern other- 

 wise as in pennsylvanicus. The skull is readily distinguishable from either 

 drummondi or fontigenus by the protruding incisors and small audita] 

 bulla'. 



Measurements. — Type, 9 ad., measured from alcohol : Total length 139; 

 tail vertebra- 39 : hind foot 20. Average of 7 specimens from type local- 

 ity, measured from alcohol: Total length 137; tail vertebrae 37; hind 

 foot 19. Skull of type: Basal length 24.3 ; nasals 6.7; zygomatic breadth 

 14.4; mastoid breadth 11 ; alveolar length of upper molar series 6.2. 



Microtias californicus vallicola subsp. now 



Type from Lone Pine, Inyo Co., California. No. Iff ft, 9 ad., U. S. 

 Nat. Mas., Biological Survey Coll. Collected Dec. 23, 1890, by E. W. 

 Nelson. Orig. No. 149. 



General characters. — Similar to M. californicus but averaging slightly 

 larger and darker; proportions the same. 



Color. — Summer pelage : Upper parts dull sepia, darkened by black 

 tipped hairs — darker and with less yellowish suffusion than in californicus ; 

 below dull grayish or smoky plumbeous ; feet dusky ; tail bicolor, grayish 

 below ; blackish above. Winter pelage: darker throughout, with black 

 hairs of back longer and more conspicuous. 



Cranial characters. — Skull like that of californicus, but audital bulla? usu- 

 ally smaller; occiput more abruptly truncate ; nasals reaching nearer to 

 tips of premaxillre ; middle upper molar with lobe at base of 4th triangle 

 often developed into a loop. 



Measurements. — Type, 9 ad.: Total length 200; tail vertebrae 57 ; hind 

 foot 23. Average of 7 specimens from type locality: Total length 188; 

 tail vertebrae 5(5 ; hind foot 23. Skull of type : Basal length, 29.4; nasals 

 9.5; zygomatic breadth 17.6; mastoid breadth 13.4; alveolar length of 

 upper molar series 7.4. 



Microtus pinetoium nemoralis subsp. nov. 



Type from Stilwell (Boston Mts.), Indian Territory, No. 87246, 9 ad., 

 U. S. Nat. Museum, Biological Survey Coll. Collected April 7, 1897, by 

 J. Alden Loring. Orig. No. 3905. 



General characters. — Size, largest of the subgenus Pitymys in the United 

 States; ears large; fur long and coarse ; colors duller than in pinetorum, 

 but hot so dark as in scalopsoides. 



Color. — Upper parts dull chestnut, slightly lined with blackish tipped 

 hairs on back and rump, becoming paler on sides ; belly washed with 

 cinnamon rufous over the plumbeous underfur ; tail indistinctly bicolor, 

 agreeing with dorsal and ventral colors of body ; feet thinly clothed with 

 pale buffy or sometimes dusky hairs. 



Cranial characters.— Skull large and relatively elongated ; supraoccipital 

 sloping ; interparietal narrow ; mastoids and audital bullae large and pro- 



