406 MR. G. R. H. BAHRETT-HAMILTOX ON [Apr. 3, 



median ventral line. But these differences, it' real, are minute, 

 and I should like to see them substantiated by the accumulation 

 of far ampler material before recognizing them subspecifieally. 



6. MUS STLVATICTS CELLAKIUS. 



Mus cellaring, J. F. Fischer, Zool. Gart. vii. p. 153 (1866), and 

 xiii. pp. 223, 224 (1872). 



Type locality. Cellars at or near St. Petersburg, Russia. 



Nomenclature. The inappropriate name cellarivs must unfortu- 

 nately apply to the subspecies of the St. Petersburg district, since 

 there can be no question that Fischer's Mus cellarius was simply a 

 cellar-haunting individual of Mus sylvaticus, at first described by 

 him as a variety, but later accorded full specific rank. 



Distinguishing Characteristics. 1 am uncertain as to the appear- 

 ance of this form, having never seen a skin of it. Mr. (jr. 8. 

 Miller, Junior, has, however, been good enough to send me over 

 a single skull (No. 3616 of his own collection), which must be 

 regarded as topotypical of the subspecies. The skull is a 

 large one, differs radically from that of M. s. typicus, and has 

 apparently its nearest relative in M. s. princeps of Roumania, a 

 supposition which gains support from the fact that Mr. Miller 

 writes of the skin, which he had unfortunately mislaid and there- 

 fore was unable to send to me, that it is simply a huge sylvaticus. 

 The skull has a greatest length of 27 and a greatest breadth at the 

 zygoma of 14 mm., so that while far larger than that of M, s. 

 typicus, it is not so large as that of M. s. princeps, the largest skull 

 of which has a total length of nearly 30 mm. It is a shorter- 

 nosed and more compactly framed skull than is that of M. s. 

 princeps, to which, however, it must be very closely allied. 



Distribution uncertain, at present only known from the type 

 locality. Probably the neighbourhood of St. Petersburg and the 

 adjacent parts of Russia. 



7. Mus sylvaticus witsttosi, subsp. nov. 



Mus sylvaticus var. fiavicollis, A. Dehne, Allgem. deut. natnrh. 

 Zeit. p. 182 (1855). 



Mus flavicoUis, W. E. de Winton, Zoologist, Dec. 1894, pp.441 

 445 ; nee Melcbior, Danske Stats og Norges Pattedyr, p. 99, pi. i. 

 (1834). 



Type. A male, No. 0.3.12.1 (British Museum Collection), 

 Gi-raftonbury, Herefordshire, 8th June, 1894 (W. E. de Winton). 



Synonymy and Nomenclature. For the original description of 

 this fine Mouse we are indebted to Mr. W. E. de Winton, who 

 discovered it at Graftonbury, Herefordshire. In his anxiety to 

 avoid the rash institution of a new name, he was led to identify it 

 with Melchior's Mus flavicoUis. Since, however, a series of Long- 

 tailed Field-mice procured by Mr. Oldfield Thomas at Hillerod, 

 Zealand, Denninvk — a locnlity almost topotypical of Melchior's 



