62 MESSRS. DANFORD AND ALSTON ON [Feb. 3, 



Leugth of head and body , . . 

 ,, tail 



„ ear 



,, hind foot .... 



Dr. Severtzoff named the House-Mouse of Turkestan "Mus wag- 

 neri ft. major {31. ^o;«a^ ?, n. sp. ?)"' without describing it; and 

 Mr. Blanford has separated the form found in the east of the same 

 country as M. pachycercus " ; both of these, if distinct, are certainly 

 closely allied to 31. bactrianus. 



40. *Mus SYLVATicus, Llon. Yaban-sytchan. D. & A., 

 no. 31. 



41. *Mus MYSTACiNUS, Danf. & Alst. Dagh-sytchan. D. & 

 A., no. 32. 



Danford did not meet with this Mouse on his last expedition, not 

 having been able to collect in any suitable localities. 



42. tAavicoLA socialis. Pall. 



To this species we are inclined to refer two small Voles which were 

 sent by Messrs. Dickson and Ross from Erzeroom to this Society, 

 and which are now in the British Museum : they agree well both 

 in dentition and proportions with Keyserling and Blasius's subge- 

 neric and specific diagnoses' , and fairly with Schreber's description ^ 

 although their tails can hardly be said to be white. The Arvicolee 

 of Western Asia and Eastern Europe are so little known, either 

 from well-preserved specimens or accurate descriptions, ihat it is at 

 present impossible to clear up the relationship between A. socialis 

 and some other nominal species, such as A. micrurus (S. G. fim.), 

 A. my st acinus, Menetries, And A. syriacus (XAcht.). But when we 

 remember the variability of the better-known European and American 

 Voles, it appears not unlikely that these will prove to be merely races 

 or varieties of Pallas's species. 



43. *tARvicoLA GUENTHERi, sp. D. (Plate V.) 



lArvicola leucura, Severtzoff, Turkest. Jevotuie, p. 82 (1873, 

 descr. orig., nee Gerbe). 



It is not with a light heart that we venture to add to the long list 

 of described species of Arvicola ; but two specimens of a Vole, which 

 Danford found abundantly in the marshes below Marash, present 

 such striking characters that no choice is left to us. The following 

 is a detailed description of the animal, which belongs to Blasius's 

 subgenus Arvicola proper, characterized by the first lower molar 

 having 7iine and the second upper molur four cemental prisms^. 



' Turkcstanskie Jevotnie, pp.61, 82; Ann. & Mag. Nat. Hist. (4th ser.) 

 xviii. p. 53. 31. wagncri, Eveismann (Bull. Soc. Imp. Moscou, xxi. V^ paitie, 

 )). 191), is usually considered to be a synonym of M. minufits, Pall. 



- J. As. See. Beng. xliv. pt. 2, p. 108 ; 2nd Yarkaud Mission, Mamm. p. 63, 

 pi. ix. fig. 2, pi. x.b. fig. 4. 



3 Wii-belth. Eur. pp. 33, .34. ' Siiugth. iv. p. 682. 



■■' Saugcth. Dcutschl. p.374. 



