GYMNODACTYLUS 43 



c'. Infradigital plates in a single series; inner digit rudimentary, 

 clawless on foreleg, clawed on hind leg. 



Perochirus Boulenger (p. 65). 

 6'. The free distal joint rises from the extreme tip of the digital ex- 

 pansion. 

 c\ A single series of infradigital lamellae. 



cT. Digits narrowed at base, distal joint long and slender; inner 



digit very rudimental Hemiphyllodactylus Bleeker (p. 65). 



d^. Digits slightly narrowed at base; distal joint short; inner digits 



well developed, clawless Lepidodactylus Fitzinger (p. 70). 



c^ A single series of infradigital lamellae. 

 (^. Digits half webbed, inner clawless.. Luperosaums Gray (p. 85). 

 d^. Digits free or slightly webbed, inner clawless. 



Gekko Laurenti (p. 90). 

 d^ Digits entirely webbed, inner clawless. 



Ptychozoon Kuhl (p. 100). 



a.^ Digits dilated, entire length with a single series of lamellae divided at 



tip only; claw sessile and retractile; body narrowed; digits slightly 



webbed Pseudogekko g. nov. (p. 103). 



Genus GYMNODACTYLUS Spix 

 Gymnodactylus Spix, Spec. Nov. Lacert. Bras. (1825) 17. 



Digits strong, clawed, cylindrical or depressed on the base and 

 strongly compressed, the remaining portion usually with a 

 strong angular kink; claw between two enlarged scales; digits 

 more or less enlarged with transverse plates below ; body usually 

 covered with granules and tubercles intermixed; males and fe- 

 males * with or without preanal or femoral pores. 



Distributed over the borders of the Mediterranean Sea, south- 

 ern Asia, Malay Archipelago, Australia, Pacific Islands, and 

 tropical America. 



The species of this genus differ greatly from the other Philip- 

 pine Gekkonidae, in the absence of broadened lamellae under the 

 toes, which enable the other species to move rapidly over smooth, 

 perpendicular surfaces, or even to run in an inverted position 

 over a smooth ceiling. In consequence lizards of this species 

 are only rarely found in houses. One group of the species of 

 Gymnodactylus is terrestrial, a large number living in desert 

 regions where they are known as sand or rock geckos. The 

 other group of the species is largely arboreal. 



The Philippine species are usually found under logs or rocks 

 or under loosened bark of forest trees a short distance from the 

 ground. Not infrequently a gecko when surprised by the over- 

 turning of a log remains quite motionless, and due to its strongly 



* Only recorded in Gymnodactylus agusanensis Taylor and G. fumosus 

 Miiller. 



