1899.] EEPTILES OF THE MALAX PEIflNSTTLA AND SLAM. 635 



46. Gecko monaechus (Schleg.)- 



Platydactylns monarchus, Cantor, p. 19. 



Gecko monarchus, Blgr. Cat. Liz. i. p. 187 ; S. Flower, P. Z. S. 

 1896, p. 868. 



Very common in certain houses in Singapore, and I have seen 

 one specimen from the Province Wellesley. 



Colour (in life). Pale greyish brown, above with very dark 

 brown spots arranged in a symmetrical pattern, below immaculate. 



Size. The two largest individuals I have measured were re- 

 spectively :— 



Total length 194 mm. (snt. to vnt. 77 ; tail 117). 



„ .... 182mm. ( „ „ 84; „ 98). 



Hah. Ceylon, Malay Peninsula, Sumatra, Nias, Borneo, Celebes, 

 Phihppines, Mysol, Amboyna. 



47. PTTCHOzooif homalocephaltjm (Crev.). 



Ptychozoon homalocephalum. Cantor, p. 20 ; Stol. .J. A. S. B. 1870, 

 p. 159 ; (part.) Blgr. Cat. Liz. i. p. 190 ; Blgr. Fauna Brit. Ind., 

 Eept. p. 104 (tig. p. 105). 



The " Flying G-ecko " has been recorded from Penang by Cantor 

 and Stoliczka ; I have also obtained one individual there myself at 

 about 2200 feet elevation. Either this or the next species is found 

 in Perak ; 1 have seen a specimen from Ipoh, in that State. 



Colour (in life). Cantor's description is very good, but where he 

 writes " white " and " whitish " my Penang specimen was bright 

 lemon-yelloiv and yellowish. Tongue and inside of mouth are lHac- 

 grey. 



Size. The above mentioned specimen from Penang, a female, 

 measured : — 



Total length 128 mm. (snout to vent 65 ; tail 63). 

 Width of head (exclusive of dermal flaps) 14-5 mm. 

 Extent across fully extended parachute 34 mm. 



Hah. Burma, Malay Peninsula, and some islands of the Archi- 

 pelago. 



48. Ptychozoon hoesfieldi (Gray). 



Ptychozoon homalocephalum (part.), Blgr. Cat. Liz. i. p. 190. 



Ptycliozoon horsfieldi, S. Flower, P. Z. S. 1896, p. 868. 



Horsfield's " Flying Gecko " has been recorded from Penang and 

 Smgapore. F. Miiller (Verb. nat. Ges. Basel, 1892, p. 210) pointed 

 out how P. horsfieldi differs from P. homalocejjhalum ; these points 

 may be summarized as follows : — 



1. The tail has no large rounded flap at the extremity, but gets 

 gradually narrower from the base to the tip. There are 

 18 lobes on each side, which are directed backwards instead 

 of standing at right angles. 



