128 COUNT NILS GYLDENSTOLPE ON 
- As has been already stated above, the work of naturalists 
during the last fifteen years, during which period there has been a 
great revival of interest in the Zoology of Siam and neighbouring 
countries, has added a considerable number of species now known to 
inhabit Siam. This number has also been increased by the discovery 
of geographical races in the adjacent islands that had hitherto remained 
unvisited. 
At the moment of writing, the Mammal Fauna of Siam has 
swollen to a total of three hundred and four species and subspecies, 
but of these nearly sixty are Island races, found exclusively on the 
Islands of Salanga (Puket), Terntau, Puiu Adang, Pulu Rawi, ete., off 
the western coast®of Peninsular Siam, and on others situated in the 
Gulf of Siam. 
Quite a number of small Islands along the western coast of 
Peninsular Siam have not been visited and explored zoologically up to 
the present time, and on these several new insular races would most 
certainly be obtained if the localities were found worth while to be 
visited by a trained naturalist. 
ORDER PRIMATES. 
1. HYLOBATES PILEATUS Gray. 
Hylobates pileatus, Gray. P.Z.S. 1861, p. 136. (Cambodia). 
Recorded from South-eastern and Central Siam (Paknam 
Krabin). 
2. HYLOBATES LAR (Linn.). 
Homo lar, Linnaeus, Mantiss. Plant. 1771, Appendix, p. 521. (India), 
Common in suitable localities throughout the whole country. 
3. HYLOBATES LEUCOGENYS Ogilby. 
I1ylobates leucogenys, Ogilby. P.Z:8. 1840, )- 20. (Siam’. 
“Siam,” without definite locality. No recent specimens have 
been obtained. 
4. PRESBYTIS NEGLECTA KEATIL Rob, & Kloss. 
Preshytis neglecta keatii, Robinson & Kloss. Journ. f°. M.S. Mus., TV. 
1910, p. 174. (Ko-khau, Trang, Peninsular Siam), 
Inhabits Peninsular Siam, where specimens have heen recorded 
JOURN, NAT. HIST. SOC, SIAM. 
