1896. ] ON A NEW GECKO FROM PENANG. 767 
8. On a new Gecko from Penang. 
By G. A. Bouteneer, F.R.S. 
[Received June 16, 1896.] 
(Plate XXXVI.) 
Among some Reptiles and Batrachians collected on Penang hill 
(at 2200 feet altitude) by Mr. Stanley Flower, and presented by him 
to the Natural History Museum, there was a new Gecko of 
particular interest. At a first glance it appears to be a Ptychozoon, 
that curious form of parachute-bearing Geckos of which we now 
know two species from South-eastern Asia, viz., P. homalocephalum, 
Crey., and P. horsfieldii, Gray. But this resemblance is merely a 
case of convergence, tor whilst Ptychozoon is a modified form of 
Gecko, the new lizard is clearly derived from Hemidactylus. The 
gap between the species.referred to Gecko and those on which 
Ptychozoon is based is so considerable, that the latter genus has 
been universally accepted by modern -herpetologists. But in the 
present case the matter is not quite so simple; for we have 
long been acquainted with a species of Hemidactylus,—H. platy- 
urus, Schn.,—which, by the presence of a well-developed fold 
along the side, foreshadows the development of the parachute 
of Ptychozoon; however, the scaling on these membranes does not 
show any modification, and therefore I have thought it fit to found 
a new genus for the species described below, which differs in the 
brick-like enlarged scales covering the side-membranes, as well as 
in the greater development of these membranes and the fuller 
web between the digits. If Ptychozoon deserves to stand as 
distinct from Gecko, it would be illogical not to allow the same 
rank to the new Penang Lizard. _I therefore propose to name it 
Mimetozoon flowert. 
MIMETOZOON, gen. nov. 
Digits extensively webbed, strongly dilated, with two rows of 
lamelle beneath ; the two distal phalanges compressed and slender, 
rising from within the extremity of the dilated portion; all the 
digits clawed. Limbs and sides of head, body, and tail with much- 
developed dermal expansions. Upper surfaces covered with juxta- 
posed granular scales and tubercles, the parachute-membrane 
covered above with imbricate tetragonal scales arranged like bricks. 
Pupil vertical. 
Mimerozoon FLOWERI, sp. nov. (Plate XXXVI.) 
Head slightly distinct from neck; snout obtusely pointed, much 
longer than the distance between the eye and the ear-opening, 
