32 GECKONID^. 



Geuus PTYCHOZOON. 

 Kuhl, in Fitziug. N. Class. Rept. p. 13 (1826). 



Digits strongly dilated, eutii-ely webbed, with undivided lamellae 

 below; all but the thumb and liallux with a compressed curved 

 distal phalanx with retractile claw, originating a little before the 

 extremity of the digital expansion. Limbs and sides of head, 

 body, and tail with much developed membranous expansions. 

 Body covered with granular scales above, with or without enlarged 

 tubercles, below with smallj-slightly imbricate scales; the membrane 

 on the side covered above with imbricate square scales ai'rauged 

 like the bricks of a wall, scaleless below. Pupil vertical. Males 

 with prseanal or praeanal and femoral pores. 



Burma, Malay Peninsula and Archipelago, Loo Choo Islands. 



Two species : — 



■Scales on side-lobes of head larger than 



largest ventrals ; end of tail broadly 



expanded ; male witli prseanal pores only P. homaloceplialum, p. 62. 

 Scales on side-lobes of bead not larger than 



largest ventrals; male with prceaual and 



femoral pores P. horsjieldii, p. 53. 



The so-called Plying Geckos, supposed to use the expansion of 

 the side of the body as a parachute*, are inhabitants of the 

 jungle, although exceptionally found about the dwellings of men. 

 Mr. Robinson mentions a specimen having been caught by a native 

 at Gunong Tahang, 3000 ft., in the act of flight from one tree 

 trunk to another. The eggs are large, two in number. 



50. Ptychozoon homalocephalum, 



Lacerta homalocephala^ Creveldt, Mag. Ges. Naturf. Fr. Berl. iii, 

 p. 267, pi. viii (1809). 



Ptychozoon homalocephalum, Cantor, Jom-n. As. Soc. Jieng. xvi, p. 626 

 (1847) ; Giinth. Kept. Brit. Ind. p. 105 (1864) ; Bonleug. Cat. Liz. i, 

 p. 190 (1885) ; id. Faun. Brit. Ind., Rept. p. 104 (1890) ; S. Flower, 

 P.Z. S. 1899, p. 635; Bouleng. Fascic. Malay., Zool. i, p. 150 

 (1903); Annaudale, Ann. &Mag. Nat. Hist. (7) xv,p, 30 (1905) ; 

 Bouleng. Jouru. Fed. Mai. St. Mus. iii, p. 64 (1908). 



Rostral large, entering the nostril ; 10 to 15 upper and 10 to 12 

 lower labials; symphysial small, subtriangular ; 3 or 4 small 

 chin-shields on each side, inner elongate. Back usually with 

 scattered convex tubercles. Scales on side-Jobes of head larger 

 than the largest ventrals. Males with an angular series of 

 21 to 26 prseanal pores ; no femoral pores. Tail much depressed, 



*"I have not the sliglitest doubt that the use of the structure is uot to 

 support the lizard in the air, but to assist it in concealing itself by causing it 

 to iit better into its surroundings and be less conspicuous than it would be 

 if its body cast a distinct simdow immediately beneath it." Annandale, 

 Ann. & Mag. N. H. (7) xv, 1905, p. 31. 



