Key to members of the genus Gekko reported from Laos

1 SVL> 160 mm; nares in contact with rostral only; iris yellow....................................... G. gecko gecko

1’ SVL <160 mm; nares in contact with rostral and first supralabial; iris not yellow................................. 2

2 SVL <80 mm, dorsal tubercles absent.................................................................... 3

2’ SVL> 80 mm, dorsal tubercles present.................................................................... 7

3 Interorbitals 41–51; scale rows around midbody 139–143....................................... G. scientiadventura

3’ Less than 41 interorbitals; less than 139 scale rows around midbody............................................ 4

4 Scale rows around midbody 120–135............................................... G. sengchanthavongi sp. nov.

4’ Less than 120 scale rows around midbody................................................................. 5

5 Interorbitals 34–37; scale rows around midbody 98–104............................................ G. aaronbaueri

5’ Less than 34 interorbitals; more than 104 scale rows around midbody........................................... 6

6 SVL 79 mm; interorbitals 26–27; scale rows around midbody 110–116, praecloacal pores 1–5; irregular blotches.................................................................................................. G. thakhekensis

6’ SVL 69 mm; interorbitals 22–26; scale rows around midbody 117; praecloacal pores 6, regular blotches.................................................................................................... G. bonkowskii sp. nov.

7 SVL 101 mm; interorbitals 36–38; scale rows around midbody 152–156................................ G. petricolus

7’ SVL 95 mm; interorbitals 27–32; scale rows around midbody 104–114............................ G. boehmei sp. nov.