130 
Il. MAMMALS. 
By H. C. ROBINSON, c.m.z.s., anp C. BODEN KLOSS, F.z.s. 
The mammalian fauna of Koh Samui and Koh Pennan proved 
disappointing and the islands are noteworthy rather for the species 
that are not represented than for those that do actually occur. 
It may safely be asserted that they have derived their fauna 
from those districts of the Peninsula immediately adjacent: for 
instance the only squirrels present are forms of the continental 
Sc. concolor and a species of Giant squirrel closely related to the 
mainland form, R.m. peninsule. No Rhinosciuwrus is known nor are 
races of Sciwrus tenuis, Sciurus vittatus or Se. nigrovittatus. Flying 
squirrels, a characteristic feature of the fauna of many of the local 
islands, may definitely be stated to be absent, and the same is the 
case with two other characteristic flying mammals—viz., Galeopterus 
and bats of the spectrwm section of Pteropus, which are known from 
almost every other island of the China Sea. Indeed for some obscure 
reason bats of all species were practically absent and, with the exception 
of the universally distributed Cynopterus, only one other individual, 
probably an Hmballonure, was even seen. Wild pigs were reported 
on both islands but they were almost certainly only feral specimens 
of the local Siamo-Chinese breed. 
Leaf-monkeys occurred on Koh Samui but have now been eaten 
out. The Kra (iLacaca irus) was found on both islands but was rare 
and shy, while M. nemestrina is stated on native authority to be found 
on Koh Pennan. Captive specimens were seen but their provenance 
was uncertain and they had not improbably been brought from the 
adjacent mainland. 
Mouse-deer were absent from both islands; barking-deer occur on 
Koh Samui (not on Koh Pennan) but are assiduously shot by the 
native population; an immature specimen was obtained by us, but 
affording no differential characters, was not preserved. 
Otters were common and the duyong is occasionally found in 
shallow bays on the western side of Koh Samui. 
1. PRESBYTIS OBSCURA HALONIFER, Cantor. 
38 6,2 9,3 ¢ immature. 
No monkeys of this genus occur on Koh Samui, though they 
were comparatively common but very wild on Koh Pennan. 
The series of five adults differ considerably inter se. Two old 
females in somewhat worn pelage have the pileum strongly tinged 
with yellowish, a marked median bronzy line on the back, and 
a pale yellowish-white area at the base of the thighs. The males 
are darker and greyer, the yellowish tinge is absent from the cap 
and the bronzy median line is practically absent in two specimens 
though just visible in the third. 
