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Sphenomorphus maculatus (Blyth, 1854) is a common skink broadly distributed in Thailand and adjacent regions. Geographic variations were analysed for meristic and morphometric characters of this species by principal component analyses. Results of the analyses consistently indicated differentiation of the species into two regional forms, one from eastern India, southern China and northern Thailand, and the other from southern Myan- mar and southern Thailand. We recognized them as distinct subspecies, S. m. maculatus (Blyth, 1854) and S. m. mitanensis (Annandale, 1905) comb. nov., respectively, using conditions of a few head scales as diagnostic charac- ters. Lygosoma melanochlorum Vogt, 1932 was assumed to be a junior synonym of the latter.
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