Mammals from Northern Angola* 409 



(6x3*7 mm.), low (height of hinder side of main antero- 

 internal cusp 3*2 mm.), and simple, the antero- internal cusp 

 not or scarcely divided into its constituent paraconid aud 

 metaconid, the hinder rim of the talon little developed, and 

 with but one low cusp on the centre of the talon (see fig. a). 



The opposite extreme to this is shown by my Herpestes 

 grandis (figured P. Z. S. 1889, pi. lxii.), where the tootli is 

 very large (8*1x4*7 mm.), high, and complicated, the ante- 

 rior trefoil well developed, and the talon with a high posterior 

 rim subdivided into cusps behind, and with two cusps on the 

 talon, one on its outer edge and one in its centre. 



East-African specimens have the tooth large (7*4: x 4*5 mm.), 

 but lower than in grandis, the paraconid and metaconid 

 distinct, the rim of the talon well defined, but not divided 

 into cusps posteriorly, and with one large cusp on the antero- 

 external part of the talon. This form I would propose to call 

 J I. a. ibeanus *. 



In specimens from Guinea, representing hempo, Temm., 

 and perhaps the original Senegalese albicaudus, m 2 is of 

 medium size (7x4*2 mm.), low, with the metaconid distinct 

 but lower than the paraconid, the median outer cusp high, 

 nearly equal to the low protoconid, the posterior rim of the 

 talon high and irregularly notched. 



Finally, in the North-Angolan form {H. a. loandce, subsp. n.) 

 the tooth is large (7*5x4*8 mm.), but its cusps and crenula- 

 tions are remarkably low and indistinct, the paraconid practi- 

 cally coalesced with the metaconid, the median outer cusp low 

 and rounded, continuous with a low transverse crest running 

 transversely across the tooth, posterior part of talon narrow, 

 its rim formed of two low cusps (tig. b). 



The skull of this mungoose is large, and all the teeth are 

 heavy and well developed ; but in the single example there 



* Subsp. n. Colour intermediate between the pale North-eastern and 

 darker Western forms, though nearest the latter, the general tone of the 

 fur, apart from the dorsal black hairs, greyish isabella. Tail white iu the 

 type. 



Dimensions of an adult skull (not the type), collected by Dr. J. W. 

 Gregory at Kibwezi, Kikuyu : — 



Basal length 100 mm. ; zygomatic breadth 51 ; front of canine to back 

 of m 2 42 ; breadth of palate outside m 2 33. 



Dimensions of teeth in the type : greatest diameter of p 4, 10, m 2 8 - 4, 

 p A 7-9, nij 8'3, m 2 7-4. 



Hub. East Africa. Type from Athi-ya-Maui, Mombasa-Uganda 

 Eailway. 



Type". Immature male. B.M. no. 99. 10. 14. 2. Presented by C. S. 

 Betton, Esq. 



The object of selecting an immature specimen as the type is to have 

 one with the diagnostic tooth unworn. 



