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Show 406 MR. G. H. H. BARRETT-HAMILTON ON [^Pr- ^, mediau ventral line. But these differences, if real, are minute, and I should like to see them substantiated by the accumulation of far ampler material before recognizing them subspecifically. 6. MUS SYLVATICUS CELLARIUS. Mus cellarius, J. F. Fischer, Zool. Gart. vii. p. 153 (1866), and xiii. pp. 223, 224 (1872). Type locality. Cellars at or near St. Petersburg, Bussia. Nomenclature. The inappropriate name cellarius must unfortunately apply to the subspecies of the St. Petersburg district, since there can be no question that Fischer's 31us 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. I am uncertain as to the appearance of this form, having never seen a skin of it. Mr. G. S. Miller, Junior, has, however, been good enough to send me over a single skull (No. 3616 of bis 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 31. s. princeps of Boumania, a supposition which gains support from the fact that Mr. Miller writes of the skin, which he had unfortunately mislaid and therefore 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 31. s. typicus, it is not so large as that of 31. s. princeps, the largest skull of which has a total length of nearly 30 m m . 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 Bussia. 7. Mus SYLVATICUS WINTONI, subsp. nov. Mus sylvaticus var. fiavicollis, A. Dehne, Allgem. deut. naturh Zeit. p. 182 (1855). Mus fiavicollis, W . E. de Winton, Zoologist, Dec. 1894, pp. 441- 445; nee Melchior, Danske Stats og Norges Pattedyr, p. 99 pi i (1834). Type. A male, No. 0.3.12.1 (British Museum Collection), Graftonbury, 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 fiavicollis. Since, however, a series of Long-tailed Field-mice procured by Mr. Oldfield Thomas at Hillerod, Zealand, Denmark-a locality almost topotypical of Melchior's |