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ZOO-GEOGRAPHICAL DIVISIONS FOR SIAM. 
By C. BopEn Koss, F.R.G.S., F.Z.S. 
While residents in Siam know the position of, or have no 
difficulty in locating, the towns, villages and various geographical 
features of that country, such is not the case with non-residents, who 
are furnished as a rule with only the small-scale map of an ordinary 
atlas. For many naturalists it wowd, therefore, lead to a clearer 
understanding of the zoology of the country, if a number of zoo-geo- 
graphical divisions were agreed upon and generally employed. 
For these I suggest the following :— 
1. Northern Siam. The Laos country, mostly mountainous or 
‘submontane, north of a line (approximately Lat. 17° 50’, but for all 
practical purposes 18? North) between the mouth of the Me Mue or 
Thoungyin River, an affluent of the Salwin, and the great eastern 
bend of the MeKawng in Long. 101° 30’ E. 
2. Central Siam. The great plain watered by the Menam Chao 
Praya and its tributaries, south of upper Siam, including the lowlands 
of the basin of the Bangpakong River in the south-east and the lower 
reaches of the MeKlawng and Petchaburi Rivers in the south-west. 
3. Western Siam. The hill country between the Tenasserim 
frontier and the Menam lowland plain from the Me Mue River mouth, 
south to Koh Lak in about Lat. 11° 45’ N. near Petchaburi. 
4. Peninsular Siam. The Malay Peninsula from Koh Lak 
south to the Malayan boundary. 
5. Eastern Siam, The “ Korat Plateau ” bounded on the north 
and east by the MeKawng, on the south by the Cambodian frontier 
and (continuing beyond this westwards ) by the southern slopes of the 
Deng Rek Range to its termination near Saraburi; thence north to 
the MeKawng bend along the watershed between the Menam and Me- 
Kawng river systems. 
6. South-eastern Siam. The varied country along the Gulf 
bounded in part by the southern edge of the Bangpakong basin (ap- 
proximately in Lat. 13° 20’ N) and partly by the Battambang-Cambo- 
dian frontier. 
In a small area like Siam, we should not expect. to find much 
variation in the zoology if it were all the same kind of country, 
but when this differs—forests and open country, mountains and 
