Mammals from the Dinka Country^ Dahr-el-Djehel. 90 



and the colour is dull, while the skull has a truncated rostrum, 

 with short nasals and small premaxillary outgrowths, ortho- 

 dont incisors, and large molars. T. rohusta (including 

 murinus, Sund.), macropus, nigHcauda, and niomhasce are 

 typical members of the first group ; while beuvf^nuta, flavipes, 

 soror, and Uodon (with its nearest allies) are repiesentative of 

 the second. In South Africa tiie distinction between the two 

 groups seems to break down or is less marked. This may, 

 however, be merely an appearance, for it is possible that one 

 ol the two groups may be missing from the country south of 

 the Zambezi. If such be the case, the group actually present 

 there must fill all the accommodation available for the genus; 

 and therefore it would not tend to be specializiid in either of 

 the two directions as is necessitated elsewhere by competition. 

 Tiie absence of rivals weakens allegiance. 



T.jiav'ipes and soror, described from the banks of the Blue 

 Nde by Mr. G. M. Allen, are clearly nearly related to hen- 

 veniita. In the absence of material fiom the Blue Nile we 

 are unable to make a proper comparison ; flavipes is, how- 

 ever, a considerably larger form than ours, wliile soror would 

 seem to be smaller, brighter in colour, and to have relatively 

 smaller bullae. 



We would take this opportunity to describe 



21. Taterona benvenuta luciaj subsp. n. 



Hub — Musisi River, Lake Albert. Altitude 2400 feet. 



Tijpe.—kn old female (B.M. 11. 12. 9. 34), collected with 

 a male in February 1911, and presented to the British 

 Museum by Mr. Gilbert Blaine. 



'i'liis ditfers from the typical form of the Bahr-el-Djobel by 

 its smaller size, shorter tail, and darker colour. 



With regard to the difference in size, the hind foot 

 measures 30-31 mm., instead of about 34 as in adults of the 

 typical form ; and the coudylo-incisive length of the very old 

 I'cmale skull is 37'8 instead of about 40 mm. 



The tail is about equal to the length of the head and body, 

 in.stead of being appreciably greater. Tlie back is much more 

 cunn)letely and extensively darkened by the black hair-tips 

 tiian in true benvenuta. 



ISkuU. — General form as in Xvxxg, benvenuta, but smaller and 

 with relatively broader brain-case; incisors with still weaker 

 grooves. 



Dimensions of the type and <S (in jjaruntlieses) : — Head imd body loO 

 (151) mm.; tail l-OI (152) ; hind loot 30 (;{1) ; ear I'J (iM). 



