A new species of the Gekko japonicus group (Squamata: Sauria: Gekkonidae) from the border region between China and Vietnam.

We describe a new species of the genus Gekko on the basis of 25 specimens from southern China and northern Vietnam. Gekko adleri sp. nov. is distinguished from the remaining congeners by a combination of the following characters: size moderate (SVL < 80 mm); nares in contact with rostral; internasal single, smaller than supranasal; postmentals enlarged; interorbital scales between anterior corners of the eyes 27-36; dorsal tubercle rows 7-11; ventral scales between mental and cloacal slit 168-190; midbody scale rows 123-144; ventral scale rows 35-44; subdigital lamellae on first toe 11-14, on fourth toe 11-15; finger and toe webbing present at base; tubercles absent on upper surface of fore limbs; tubercles on tibia 0-8; precloacal pores 17-21 in males; postcloacal tubercle single; tubercles present on dorsal surface of tail base; subcaudals enlarged; dorsal surface of body with four or five narrow light bands between shoulder and sacrum.