KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 58- NIO 2. 45 



ago at the place mentioned. The measurements of this are recorded to the right in the 

 table above. From this can be seen that the Hoima Baboon is a little smaller in most 

 dimensions, although these differences are of minor importance. The most conspicuous 

 difference is that the Hoima Baboon has the nasals flat in front, and only little raised 

 behind in which respects it resembles P. furax. The lateral walls of the rostrum are less 

 vertical, and the pits above the roots of the molars are less deep, even than in the semia- 

 dult tessellatus. 



Although it thus appears to be racial differences between this Baboon and P. tessel- 

 latus, I prefer to leave it unnamed until more material has been obtained. 



Perodictius arrhenii n. sp. 



A male specimen collected near Masisi, a place situated three days west of Lake 

 Kivu, Febr. 1914. 



General colour brown, representing a shade between »snuff brown» (Dauthénay 

 303) and »dark fawn» (Dauthénay 307, 2). This general colour is more or less overlaid 

 with blackish on the back. This black shade gradually increases from the lower back 

 towards the interscapular region, where a marbled or mottled appearance is produced 

 in which the black almost predominates. On the forehead, the region around the ears 

 and on the upper arms the blackish is rather strongly represented as well by long black 

 tips to the hairs. The basal parts of the fur is dark grey, or slaty gray. Especially on 

 the middle of the back and on the upper back there is a great number of hoary-tipped 

 hairs which in certain shades of light produce a frosty appearance. The long and thin, 

 bristle-hairs (sensitive!), which project far above the fur, are especially numerous on the 

 upper back, neck, head and shoulder-region, and they are all white. The outer side of 

 the limbs are similar to the adjoining parts of the back, thus the upper arms are rather 

 strongly overlaid with blackish, but the thighs not. The tail has the colour of the back, 

 hut is dusky at the tip. The inside of the hind limbs, and the genital and anal regions 

 are buffy. The inside of the forelimbs, and the throat are a light shade of snuff-brown, 

 or a little more buffish. The rest of the lower parts are whitish grey, especially in the midd- 

 le with a buffish tint. The hands and feet are »raw umber» (Dauthénay 301) darkening 

 to »sepia» (Dauthénay 300) on fingers and toes. 



By this colour the present specimen differs very plainly from the grey P. ibeanus 

 from Elgon. P. ju-ja of Southern Nigeria appears also to be very different in colour 

 being describcd as »drab-grey», and with the »bristle-hairs practically absent». 1 P. ed- 

 ivardsi from Gaboon is said by De Winton 2 to be »du 11 greyish » and »characterized by 



its short tail ». The latter characteristic is mentioned in connection with the descrip- 



tion by the author quoted of P. batesi (from Benito River) which is said to ha ve the length 

 of the tail 40 mm., and it is said to be »as short as or shorter than that of P. edwardsi». 

 The tail of the latter cannot thus in any case be much longer than 40 mm. As the length 

 of the same organ in the present specimen is fully 70 mm. (without hairs) it thus differs 



1 Thomas: Ann. & Mag. Nat. Hist., Ser. 8, Vol. V, p. 351—352, 1910. 

 - Ann. & Mag. Nat. Hist., Ser. 7, Vol. IX, p. 48, 1902. 



