364 MR. ©. BODEN KLOSS ON 
24. Sciurus atrodorsalis pranis. 
Seiurus erythraeus pranis, Kloss, Journ. Nat. Hist. Soc. Siam, IT, 
p- 178 (1916). 
Sciurus atrodorsalis, Gyldenstolpe, Kungl. Sv. Vet. Akad. Handl., 
57, No. 2, p. 35 (1917). 
5¢ ad., 23 subad.; 62 ad., 19 subad. 22 juv. Koh Lak. 
In the original diagnosis I referred these squirrels to 
rubeculus Lyon (regarded as a form of erythraews) because in size 
and colour of upper parts some of them exactly resembled a 
specimen from Bok Pyin, South Tenasserim, from which 
I considered them distinct on account of their paler underparts and 
paler albescent-tipped tails. The type of rwheculus came from 
Trang, Peninsular Siam, and with it were associated four specimens 
from South Tenasserim, one of which is the above-mentioned Bok 
Pyin example. 
Further examination shows however, that the Bok Pyin 
animal (and doubtless the others from the neighbourhood ) is not 
typical; for on comparing it with a series from Tung Song and 
Kao Nong in. the state of Nakon Sri Tamarat (the first place 
about 30 miles and the latter 80 miles from the typical locality, 
while S.Tenasserim is about 180 miles away) it proves to be less 
richly coloured above, while it is also intermediate in size between 
the smallest example of rwbeculus and the largest of pranis. 
Northern animals, even the darkest, are much less richly coloured 
than the Southern ones, both above and below, and are also smaller. 
I think, therefore, that pranis is a well-differentiated form of 
atrodorsalis with which it agrees in size; there is frequently a 
slight blackening of the posterior back which also indicates a con- 
nection ; this is quite absent in rwhecwlus. 
Characters, Smaller than rwbeculus; paler above and with- 
out the Mars-yellow suffusion on the nape and body; below, the 
grizzled areas much paler and the coloured parts ochraceous though 
sometimes washed with rufous; in rwheculus, however pale the 
coloured areas may be, there isalways present a tone of mahogany- 
red, 
Size about as in typical alrodorsalis, but with the median 
JOURN, NAT, HIST, SOC, SIAM, 
