KUNGL. SV. VET. AKADEMIBNS HANDIJNGAB. BAND 48. N:0 5. 157 



The belly and under parts generally are pure white, sometimes with sharp limi- 

 tation, sometimes with a narrow pale isabelline band bordering the lower flanks. The 

 throat is also white but the lower side of the neck is like its sides grizzled, although 

 with still more white. The face and muzzle »buff» (Rep. de Oouleurs 309. 3), the 

 sides of the head like the neck. A white eyebrow-mark is present. The crest of the 

 males is black with broad whitish subterminal rings on the anterior, and rufous buff 

 rings on the posterior hairs. In the females the crest is much shorter, and its poste- 

 rior portion consists of rufous hairs with long black tips. There is thus a considerable 

 difference between the sexes with regard to the crest as well. The feet are a little 

 paler buff than the face. 



With regard to the pure white of the lower side these specimens agree with 

 Rh. guentheri wroughtovi Drakb-Brockman but differ from Rh. guentheri in which, 

 according to the author quoted^ »the yellow grizzling fades somewhat gradually into 

 the pale pinkish buff of the chest and abdomen*. It is thus also with regard to 

 the colour easy to distinguish these specimens from Rh. guentheri, but it is more 

 difficult to express any opinion about their relation to Rh. g. wroughtoni a single 

 specimen of which has been shortly described from the »foot hills of Mt. Akul Kas- 

 sim, Wabi River Gallaland, Abyssinia within 20 miles west of Sheikh Hussein*. To 

 make sure about the identity I took the liberty of sending one of my specimens to 

 Brit. Museum for comparison with the type of this subspecies, and Mr Guy Dollman 

 kindly replied that s>the colour is exactly the same, both as regards pattern and 

 tint*. 



With regard to cranial measurements the type of Rh. g. wroughtoni is similar 

 to the present specimens except that it has considerably longer nasals viz 13 mm. 

 But Dollman's comparison settles the question. It is therefore to be assumed that 

 the type specimen of Rh. g. wroughtoni had unusually long nasals and that these 

 bones vary in length more than hitherto has been known. Drake-Brockman has said 

 that the ears of Rh. g. wroughtoni are longer and broader than in other species except 

 Rh. cavendisM, .but exact measurements are not given for either of these. The length 

 of the ear of the specimens from Guaso Nyiri is about 94 mm. and the length of 

 the opening of the ear-conch is about 73 mm. The latter measurement is about 

 similar to that of Rh. nasoguttatus. 



Drake-Brockman's description is rather short, and I have therefore discussed 

 these specimens somewhat fully to show the variability of the species and make it 

 better known for the future. For the same purpose the accompanying table of mea- 

 surements of five skulls has been prepared. The type locality of Drake-Brockman's 

 subspecies is situated very far from the one where my specimens have been collected 

 and this appeared to begin with to speak against the identity as the Dik-diks often 

 have a rather restricted habitat. 



1 Ann. & Mag. Nat. Hist. Ser. 8 Vol. IV, p. 51. 



