1899.] NATURAL SCIENCES OF PHILADELPHIA. 289 



normal. The enamel pattern of the remaining teeth is like that 

 of M. arvalis. 



Specimens examined. — Dr. Abbott collected only one specimen of 

 this species. 



Remarks. — Microtxis pamirensis differs too widely from any de- 

 scribed form to require detailed comparison. 



Measurements. — Head and body, 105; tail vertebrse, 34; pencil, 

 4; hind foot with claws, 18; hind foot without claws, 16; ear from 

 meatus, 12; width of ear, 13.8. 



Subgenus HYPERACRIUS Miller. 

 1896. Hyperaerms Miller, North American Fauna, No. 12, p. 54. 

 July 23, 1896. Type Arvicola fertilis True. 



During his first and second visits to Kashmir, Dr. Abbott col- 

 lected th% five specimens that subsequently formed the basis, of the 

 descriptions of Microtus fertilis and of the subgenus Hyperacriiis. 

 During his last expedition he obtained another specimen which 

 differs so considerably from those previously collected that it must 

 be regarded as the representative of an undescribed species. The 

 three species of Hyperacrius now known may be recognized bv the 

 following characters: 



Key to Species of Hyperacrius. 

 Hind foot (with claws) 19; upper tooth row 7. 



M. aitchisoni Miller.* 

 Hind foot (with claws) 16-18; upper tooth row 6. 



Ear from meatus 10-11 31. fertilis (True), 



Ear from meatus 7.8. . M. bracheli^ sp. nn\. 



Microtus fertilis (True). 



1894. Arvirola fertilis True, Proc. U. S. National Museum, xvii, p. 10. 



May 8, 1894. 

 1896. Microtus fertilis Miller, North American Fauna, No. 12, p. 55. 

 July 23, 1896. 



Type locality. — Pir Panjal range, Kashmir. Altitude, 8, 500 feet. 



Specimens collected. — Dr. Abbott has taken no specimens of this 

 species in addition to the original series of five skins procured dur- 

 ing his first and second visits to Kashmir. These were taken at 

 the following localities : 



Pir Panjal range, 8,500 feet. 



*Proc. Biolog. Soc. Washington, xi, p. 141. May 13, 1897. From Gul- 

 merg, Kashmir. Type in British Museum. 

 19 



