724 MR. II. I. POCOCK — A REVisioiN OF [June 18, 



fi'om the examples of C. cephus from the Benito River, in having 

 a thick fringe of yellovi^ish-white hair upon the ears, and in 

 having a greater quantity of black in the hairs on the crown of 

 the head. 



Pousargues did not admit that any systematic importance was 

 to be attributed to the absence of red in the tail. But his series 

 of skins does not establish the fact that the two forms occur 

 together in the same locality. If that were the case, I think one 

 would be compelled to assume, from the available evidence, tha.t 

 G. cephus is dimorphic with respect to the colour of the tail. It 

 may be so ; but, pending the establishment of this conclusion, 

 and in consideration of the possibility of the character being- 

 correlated with a difference of distribution or habitat, I think it 

 should be nominally emphasized, and the two forms be known by 

 distinct names until their identity has been fully established. 



That the name cejyhus must be assigned to the red-tailed form 

 is proved by the original diagnosis of Linnteus, which says : — 

 " Gcaidm medietas tdtima ex ruffo flavescens .... ccmda apice 

 ferruginea." 



The two may be contrasted as follows : — 



a. The tail, at least in its distal portion, coppery red above and below; 



hairs on the ear «hite Subsp. cephus. 



a'. Basal portion of tail the same colour as the sacrum above and 

 greyish below, becoming gradually darker distally ; a thick fringe of 

 j'ellowish hairs on the ear Subsp. cephodes. 



I regard as typical 6'. cephus some examples in the British 

 Museum, two males and two females from the Benito River, 

 Congo, and one female from Como River, Gaboon, collected by 

 Mr. G. L. Bates. All are adult, and although taken ^practically 

 at sea-level, they have remarkably long and thick coats. Two 

 females, shot in June and July, are more richly coloured than one 

 shot" in December, and are perhaps a little longer in the coat. 

 A male killed in October is long-coated and coloiu'ed like a female 

 killed in June. 



The type of C. c. cephodes is the above-mentioned specimen, a 

 subadult male, in the British Museum, ticketed " Gaboon (Laglaize 

 Coll., 80.6.7.3)." The total length of the head and body of the 

 dried and twice made-up skin is 413 mm., and of the. tail 

 575 mm. I have seen other examples of this subspecies living in 

 the Gardens. One was brought by Mr. Hamlyn from the forest 

 between Loangc and the Gaboon. In addition to these there 

 are two skins in the collection of the Society. One of these 



