94 EINAR LONNBERG, MAMMALS COLLECTED IN CENTRAL AFRICA. 



overlaid with blackish which occupies the extreme tips of many hairs. The black dorsal 

 band is very broad, and there is a still broader ventral black band, extending from the 

 chest between the forelegs and ending a little in front of the teats. The lower flanks on 

 the sides of this mesial black ventral band are a little paler, and less red than the upper 

 parts of the sides. The feet are brown rather resembling »otterbrown» (Dauthenay, 

 Rep. de CouL, 354, 4), but gradually darkening to black up on the legs. This black ex- 

 tends on the fore-legs a good deal above the elbow, but becomes thinner on the shoulders 

 where it finally is represented only by black tips to the rufous hairs. A strip on the inner 

 side of the fore-legs extending down to the carpal joint has the same pale colour as the 

 lower flanks, sharply contrasted to the blackish brown of the outer side. On the hind 

 legs there is no such pale colour stripe, the posterior side being black (almost) to the 

 hoofs. The front side is dark »otter brown » to the tarsal joint, gradually blending into 

 the black, which extends well up on the hams, where it shades off with black tips to the 

 hairs. Along the posterior side of the hams is a pronounced blackish band produced by 

 long black tips to the hairs. The upper side of the tail is black in continuation of the 

 black dorsal band, the underside, and partly the tip is covered with white hair. 



The colour of the head is about similar to the same in castaneus, only a Httle darker. 



From this description it is apparent, that the specimen from Beni also with regard 

 to its colour differs very plainly from the typical castaneus. 



in the year 1914 E. Schwarz described^ a Duiker of this group from the Welle 

 district. According to the short diagnose that one (named ) C. dorsalis orientalis, is »extern- 

 ally not distinguishable from the other forms of C. dorsalis », but its skull is said to be 

 »much larger than in any of them». The cranial measurements recorded by Schwarz 

 for his G. d. orientalis are almost identical with those tabled above for the castaneus form 

 from Mukimbungu, and with those which have been quoted for Thomas's Congo specimen 

 similarly named. If thus G. d. orientalis proves to be a valid subspecies, not only the 

 specimen from Mukimbungu, Lower Congo, referred to above, but also Thomas's speci- 

 mens from Congo, from which he quotes the above cited cranial measurements, must be 

 regarded as belonging to Schwarz' s subspecies. The last author says (1, c): »There is 

 a gradual increase in size and facial length in the local races of G. dorsalis from »the West- 

 coast forms like G. d. dorsalis » which »are small and have a short rostrum » — . 



»C d. castaneus from South Nigeria and the Western Cameroon » should then come next, 



and finally »the races of the Congo forest, as typified by orientalis » . The wrien- 



talis» has, to judge from measurements recorded in the literature (some of which are 

 quoted above), the basal length of the skull only 6,5 to 9 mm. longer than the adult 

 castaneus from Cameroon," but it appears certainly to be larger. Its distribution extends 

 as far as is known from Lower Congo (Mukimbungu) to the Welle district (fide Schwarz) 

 and Stanley Falls (fide Thomas). In the north-eastern part of the Congo forest it is sub- 

 stituted by the smaller and darker form described above. The members of this group of 

 Duikers thus decrease very decidedly again in size without reducing, however, the com- 



1 Ann. & Mag. Nat. Hist. (8), Vol. 1.3, 1914, p. 35. 



' Cf. the meas-urements quoted from Sjostedt above. 



