| Summary: | CONTENTS\nIntroduction . 83\nThe identification of the sampled specimens. 85\nThe variability of the studied characters. 90\n\xce\xb9. The external characters. 90\na. The coat colour. 90\nb. The length of hairs. 91\nc. The length of the meatal lobe of the ear. 91\nd. The tail. 92\ne. The feet . 93\n2. The shape of the molars. 93\n3. The characters of the skull. 102\n4. The characters of the mandibles. 105\n5. Skull with mandibles. 106\n6. Skin with skull and mandibles . . 106\nDiagnoses of Microtus arvalis and Microtus agres\xc3\xbcs. 106\nReferences. 107\nINTRODUCTION\nA number of characters has been used by several authors to seperate Microtus arvalis (Pallas, 1778) from Microtus agrestis (Linnaeus, 1761).\nHusson (1962: 27-28, 33) enumerated several characters of these forms to identify skull remains from owls pellets found in The Netherlands, Belgium and Luxemburg. Frank (1953) and Van Wijngaarden (1956) gave some external characters useful in field work. Unfortunately, none of these characters separates the two species completely and using them it is therefore
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