IN WEST AFRICA. 57 



Notwithstanding all these unfavourable circumstances the 

 collections contain several valuable and interesting objects. 

 I shall not enumerate all but merely mention some of 

 the more interesting or rare species. 



Amongst the mammals I hailed with satisfaction three 

 beautiful specimens of the true Colohus ursinus, exactly 

 similar to the specimen from Sierra Leone figured by Era- 

 ser. It is now definitely proved by these specimens that Co- 

 lohus ur sinus differs constantly from Colohus vdlerosus , which 

 inhabits the Gold Coast, thus corroborating my state- 

 ments about these two species in the «Monographic des 

 Singes" which I published a few years ago. Another in- 

 teresting curiosity of the collection is a young but very 

 beautiful specimen of Cephalophus doria, together with the 

 head of a somewhat older female of the same species. New to 

 science are a species of squirrel (Sciurus salae Jentink vide 

 infra) and a genus of Pteropi without claws on the index 

 fingers (Leiponyx hüttikoferi Jentink). The travellers met with 

 only one specimen of Hippopotamus ^'/6m(^??.ses, which how- 

 ever had been caught by the negroes and had been cut 

 into pieces before their arrival. Hyaemoschus aquaticus al- 

 though spread over the woods could not be captured ; Po- 

 tamogale appears to be entirely unknown in the country. 



Of the birds the following present more particular in- 

 terest. Agapornis sioinderiana occurs in small numbers 

 and lives in the crown of the trees. Psittacus timneh is 

 the only larger parrot in the country, representing with- 

 out exception the common species Psittacus erythacus. A 

 single female specimen of a true sparrow-hawk which shows 

 exactly the same character as the male ftype of Nlsus ery- 

 thropus of the Leyden Museum) proves that this species 

 constantly differs from Nisus minullus. Only one specimen 

 was procured of Columha unicincta Cassin, the type of 

 which was captured by du Chailla on the Ogoway and is 

 now in the Philadelphia Museum. Of the beautiful Co- 

 lumha iriditorques Cassin, also discovered by du Chaillu 

 there are only a few specimens. Of the genus Centropus 



Notes trom tlie Leyden IMuseum, Vol. HI. 



