抄録
Sri Lanka has four primate species, the toque macaque (Ms), gray langur (Se), purple-faced langur (Ss) and slender loris. The main objective of this on-going study is to up-date the approximate distribution of each of these species to the sub-species level. The census is conducted using multi-lingual / picture questionnaires distributed throughout the country by students of the University of Sri Jayawardenepura, Colombo and extensive surveys by the authors, interviewing local inhabitants and direct observations at sites across the country. Three extensive surveys were conducted so far in 5 provinces covering the lowland, central, highland dry and wet zones. Ms have the widest distribution both in the dry and wet zones. Se are distributed mainly in northern and southern dry zones while Ss are distributed in the lowland wet and dry zone and the highlands. Mixed species grouping were noted for Ms and Se in the southern dry zones.
