Seven of the ten Liphistius species already known from Thailand and Burma are characterized; three new species, L. lannaianus sp.n., L. marginatus sp.n., L. thaleban sp.n., and the males of L. lordac Platnick & Scdgwiek and L. niphanae Ono are described. Taxonomy and relationships are discussed; considerable variation in female internal genitalia is shown. Notes are given on natural history, distribution, burrow structure, phenology and behaviour.