134 SAURIA. 



A small tubercle behind the superciliary edge ; ten upper labials ; sides of the nape tuber- 

 cular, one larger tubercle on each side of the commencement of the nuchal crest. Twelve 

 very small molars on each side of the upper jaw, thirteen larger ones below ; the latter are 

 closely set and triangular. A fold of the skin before each shoulder, not extending across 

 the throat. Dorsal crest low, extending on to the root of the tail, which is rather com- 

 pressed ; only the upper dorsal scales have their points directed upwards, those on the sides 

 point straight backwards. Ventral scales strongly keeled; there are about thirty-eight 

 in a longitudinal series between fore and hind limb. The hind limb extends to the eye, if 

 laid forwards ; the fourth hind toe is one-iifth longer than the third. 



Brov\Tiish grey, a white band along each side of the back ; back between the white bands 

 with broad, angular, black cross bands, the points of which are directed backwards ; these 

 bands are separated from one another by narrow, angular, white cross streaks formed by the 

 larger scales, which are intermixed between the small ones and of a white colour. The 

 remainder brownish grey ; head and sides subreticulated with brown ; legs and tail with 

 brown bands, the latter about fifteen in number. 



Only one specimen was obtained at Formosa by Mr. Swinhoe, H.B.M. Consul at that 

 place ; it is 8 inches long, the tail measuring 5f inches. 



Japalura polygokata. 



Diplodcnna polygonatum, Hallowell, Proe. Acad. Nat. Sc. Philad. 1860^ p. 490. 



This appears to be a third species of this genus, although its characters are not well pointed 

 out ; it is described as being uniform greenish olive above ; eight dark-coloured bands on the 

 tail ; seven upper labials ; no fold across the chest ; neck slightly folded. 



A single specimen was obtained on Amakarima Island (Loochoo) ; it is 7 inches 9 lines 

 long, the tail measuring 5^ inches. 



SITANA, Cm. 



Limbs long, with five toes in front and with only four behind. Scales 

 regularly arranged, keeled. Tympanum visible. Scarcely any crest on the 

 neck ; male with a very large gular appendage which can be folded up like 

 a fan. Femoral pores none. 



One of the most easily distinguished genera, having only four toes behind. Head tetra- 

 hodral, with the snout of moderate length ; body slightly compressed ; tail longish, rounded. 



