. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. African and Asian Tatera 275 Ethiopia (' N ' E). The greatest length of skull of the holotype was given as mm and the zygomatic breadth as mm. The tail was described by Frick as "well clad, hair shorter than in T. n. nyama, anterior fourth of tail warm buff- colored with white markings underneath, posterior 3/4 black". Again this would ap- pear to be a T. robusta with a dark tail, a characteristic of this species in south- western Ethio
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. African and Asian Tatera 275 Ethiopia (' N ' E). The greatest length of skull of the holotype was given as mm and the zygomatic breadth as mm. The tail was described by Frick as "well clad, hair shorter than in T. n. nyama, anterior fourth of tail warm buff- colored with white markings underneath, posterior 3/4 black". Again this would ap- pear to be a T. robusta with a dark tail, a characteristic of this species in south- western Ethiopia. Little is known of the ecology of T. nigricauda. Neal (1984) noted that it shares the same food plants as T. robusta and it has been collected from the same localities. Tatera valida (Bocage, 1890) Gerbillus validus Bocage, 1890. — Jörn Sei. Math., Phys. e Nat., Lisboa, (2) 2: no. 5, p. 6, pi. 1. Am- baca, Quissange, Caconda, Rio Cuando, Angola. Material: A total of 502 specimens were examined. These came from 117 localities, both from within north-east Africa in Ethiopia, Kenya, Sudan, Uganda and extralimitally from Angola, Central African Republic, Chad, Nigeria, Tanzania, Zaire & Zambia. Diagnostic description: This is a medium-sized Tatera, with a greatest skull length in north-east Africa of to mm, (Table 4). The tail of 77 valida is characteristically short and normally does not exceed head & body length. It is generally pale brown colour and never has a terminal tuft of dark hairs. This distinguishes it from all other Tatera in north-east Africa. The hindfoot is also com- paratively small. The mean body weight of T. valida (Table 4) exceeds that of T. robusta (Table 1) in both sexes. The skull of T. valida has a relatively short, broad rostrum as compared to T. robusta, (Fig. 8). The mandible is proportionately long for the length of skull in com- parison to the other species, except T. boehmi. No specimen from within north-east Africa was seen
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