. Catalogue of the mammals of western Europe (Europe exclusive of Russia) in the collection of the British Museum. 691 1907. Microtus arvalis incertiis Mottaz, M6m. Soc. Zool. de France, xx, p. 32, September, 1907. 1910. Pitymys inccrtus Trouessart, Faune Mamm. d'Europe, p. 188. Type locality.—Near summit of St. Gothard Pass, Uri, Switzerland. Geographical distribution.—Mountains of Switzerland and Tirol, from the central Alps eastward. Details of distribution very imperfectly known. Diagnosis.—Like Microtus arvalis, but skull tending to assume a distinctly fossorial aspect, the occipital regi
. Catalogue of the mammals of western Europe (Europe exclusive of Russia) in the collection of the British Museum. 691 1907. Microtus arvalis incertiis Mottaz, M6m. Soc. Zool. de France, xx, p. 32, September, 1907. 1910. Pitymys inccrtus Trouessart, Faune Mamm. d'Europe, p. 188. Type locality.—Near summit of St. Gothard Pass, Uri, Switzerland. Geographical distribution.—Mountains of Switzerland and Tirol, from the central Alps eastward. Details of distribution very imperfectly known. Diagnosis.—Like Microtus arvalis, but skull tending to assume a distinctly fossorial aspect, the occipital region depressed (ratio of occipital depth to occipital width about 50 "5 instead of 58), the rostrum elongated (diastema usually about 8 mm. in adults instead of about 7"5 mm.), the upper incisors projecting forward; auditory bulla? small and flattened. External characters.—So far as can be determined from skins, the external characters are in all essen- tials as in Microtus arvalis, though from the peculiarities of the skull it seems probable that the head is more flattened and the incisors more pro- truding ; fur tending to be longer and less dense. Colour.—In a series of skins the colour is, on the average, less bufTy above than in Microtus arvalis arvalis, and the underparts are more fre- quently a clear, slate-tinged grey. The colours are dull and blended, with very slight indication of grizzling, even in individuals with elements of the colour nearly as in M. arvalis dupliratns. Measurements.—Adult male and female from Andermatt, Uri, Switzerland: head and body, 114 and 108; tail, 41 and 37; hind foot, 16 and 15-5. Adult male from Furka Pass, Switzerland: head and body, 113; tail, 31 ; hind foot, 15-4. Average and extremes of eight adults from Vulpera-Tarasp, Grisons, Switzerland: head and body. 111 (104-119); tail, 36-5 (30-41); hind foot, 16-4 (15-6-17); ear from meatus, 11-7 (11—13). For cranial measurements see Table, p. 692. Specimens examined.
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