On the Squiireh of the Sciurua Prcvo.stii Grouj>. 107 



c\ Tnil blfu-k. 



c*. Aiiiiulalions on bairsof buck broad. .S'o. <•. cri/t/toi/astcr 



(winter). 

 (P. .Nnnulationsonhftirsof back narrow. Sc. e. jnttictatissitnus. 

 b\ Tail-bairs witb fulvous tiji.'j. 



a'^. Indi-rparts uiiifornily coloured .... So. thaiicancnsis liubeiii. 

 U*. linderjmrts witb g^rizzled median 



line Sc, t. ccutnilia. 



H. Undeqiarta same colour as tbe back .... Sc. t. tifpicus. 

 (.'. Ilnderi>art8 viuacuous (viuaceou3 rufuus, 

 ]{tdi/wuy). 

 a\ Undi-rjmrts uniformly coloured. 



rt^ Hack brownisb Sc. castaneovcntriatypicxu. 



I)''. IJack greyisb Sc. c. nitujpvensis. 



6'. Uiiderpart*! witb grizzled median line. 



a'. Rufous area narrow Sc. c. Gurdoni. 



l>^. Ku foils area broad Sc. c. yriseopectua. 



\). Undorjinrtd yellow Sc. Stijani. 



E. Underparts black Sc. vulanugaster. 



XX. — On the Squirrels of the Sciurus Prevostii Group. 

 hy J. L. BoNHOTE, B.A. 



This group of squirrels, like the other groups with which I 

 have already dealt, shows clearly that, although a certain 

 amount of variation may be found in individuals frum the 

 same locality, yet when a large series comes to be examined 

 there is no doubt as to the locality from which any particular 

 individual may have come, and the differences, although in 

 some instances slight, are in all cases constant. From the fact 

 that the various races are geographical, it necessarily follows 

 that there must be intermediate form.s, and some of the races 

 about to be described show this intergradation in a very 

 marked degree. 



For example Sciurus Caroli, described in this paper, is a 

 very constant race and markedly distinct from Sciurus Caroli 

 griseicauda, which, on the other hand, although constant in 

 its essential characters, shows a wide range of individual 

 variation. 



Another point to be noted in regard to this paj)er is the 

 case of Sciurus atricapillus from S.W. Borneo, 'i'here are 

 no specimens in the Museum from that locality, so that one 

 is unable to judge whether the differences between Sc. atri- 

 capillus and -Sc. Caroli should entitle them to rank as s|)ecio3 

 or sub.^pecies. I have therefore described the latter as a new 

 species, though the advent of lurthor material may prove it to 

 be only a subspecies of Sc. atricapillus. 



