. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 274 P. J. J. Bates nigricauda. Therefore all the Omo and Kalam specimens, including those with the karyological data have been assigned to T. robusta. Variation: There is significant sexual dimorphism, with males exceeding females in size in the majority of external and cranial measurements. It is most apparent in head & body length, greatest length of skull, zygomatic breadth, rostral width, rostral length, mandible length and body weight. There is also signifi
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 274 P. J. J. Bates nigricauda. Therefore all the Omo and Kalam specimens, including those with the karyological data have been assigned to T. robusta. Variation: There is significant sexual dimorphism, with males exceeding females in size in the majority of external and cranial measurements. It is most apparent in head & body length, greatest length of skull, zygomatic breadth, rostral width, rostral length, mandible length and body weight. There is also significant geographical variation. The T. nigricauda from north-eastern Tanzania and southern Kenya are comparatively large and have very dark, usually black tails, with only a very few pale hairs on the ventral surface. The specimens from northern Kenya and Somalia are smaller and their tails, although covered in dark brown or black hairs on the dorsal surface usually have pale hairs on the ventral surface, especially on the distal third of the tail. Two races are therefore recognized, the nominate in the south and T. n. nyama, which includes the form percivali, in the north. Their respective measurements are given in Table 3. Distribution: Tatera nigricauda has a relatively restricted distribution. No specimens were seen from west of the Eastern Rift Valley or from Ethiopia (Fig. 7). The two subspecies would appear to be essentially divided north and south of the Tana Fig. 7: Distribution of the two races of Tatera nigricauda. Scale = 300 km. Remarks: It is proposed that the form bayeri Lonnberg, 1918, generally referred to T. nigricauda, be included in the synonymy of T. robusta. This form was con- sidered by Davis (1975) to be a distinct race of T. nigricauda from west of the Eastern Rift Valley. The type locality was Maroon River, near Mount Elgon (' N ' E). However, all specimens examined from this area were found to be referable to T. robusta, although they
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