DEAR EDITOR,rnWe report on a new species, Micryletta dissimulans sp.nov., from the lowland forests of southern Thailand, which is described based on molecular and morphological evidence.The new species is characterized by a combination of the following characters: small body size (20.3-22.4 mm in males, 24.4-26.7 mm in females);slender body habitus;head longer than wide;snout rounded in dorsal and lateral view;eye length equal to snout length;tibiotarsal articulation reaching to tympanum;dorsal surface slightly granulated to shagreened;supratympanic fold indistinct, ventrally edged in black with large black spot behind eye;outer metatarsal tubercle absent;dorsum reddish-brown with merging irregular-shaped brown blotches edged in beige, no black spots on dorsum;body flanks brown with large black spots edged in whitish mottling, two large black blotches in axillary and inguinal areas on each side;lateral sides of head black, with white patches on lips absent, whitish mottling on tympanum and axillary region;ventral surface pinkish to bluish-gray, translucent, laterally with dark-brown marbled pattern, medially immaculate;throat in males dark-gray with sparse white mottling laterally;iriscopper-orange.