On the Squirrels of the Sciurus Prevostii Group. 167 
ce?, Tail black. 
e*, Annulations on hairsof back broad. Se. e. erythogaster 
(winter). 
d*, Annulationson hairsof backnarrow. Se. e. punctatissimus. 
b', Tail-hairs with fulvous tips. 
a*, Underparts uniformly coloured .... Se. thavwanensis Roberti. 
b*. Underparts with grizzled median 
Wire etastenegePateny tstevs 8 S.6 «side x cyetags. = whe Se, t. centralis. 
B. Underparts same colour asthe back .... Sc. t. typicus. 
C. Underparts vinaceous (vinaceous rufous, 
Tidyway). 
a’, Underparts uniformly coloured. 
Groat ack DYOMMISN Gai aisesioneced dere: Se. castaneoventris typicus. 
OA AC Kio Tevaste Ms <i dons euler Se. c. ningpoensis, 
b'. Underparts with grizzled median line. 
a*, Rufous area narrow. ...... cae ey Ncres GOrdont. 
6. Rufous area broad ........ siieam sy Gs Cr QUESCOPeClUs. 
1), Underparts yellow... sau 26 scierkie es ss Se. Styant. 
HsUnderparts blacks. s.¢oanAtve vee «nes Se. melanogaster. 
XX.—On the Squirrels of the Sciurus Prevostii Group. 
By J. L. Bonuorte, 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 from 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 forms, and some of the races 
about to be described show this intergradation in a very 
marked degree. 
For example Scturus Caroli, described in this paper, is a 
very constant race and markedly distinct from Sccurus Caroli 
grisetcaudau, 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 paper is the 
case of Scturus atricapillus trom S.W. Borneo. ‘l'here are 
no specimens in the Museum from that locality, so that one 
is unable to judge whether the differences between Se. atri- 
capillus and Se. Caroli should entitle them to rank as species 
or subspecies. I have therefore described the latter as a new 
species, though the advent of further material may prove it to 
be only a subspecies of Se. atricapillus. 
