AMPHIBOLURUS. 413 



reaches the shoulders, it is suddenly lowered, composed now exclu- 

 sively of one series of very convex, much larger scales than the adjoin- 

 ing ones on the sides of the back; over the tail, the crest merges into 

 a slight ridge, scarcely distinguishable from the carination of the other 

 scales. On the upper surface of the tail, the scales are much larger 

 and broader than on the sides of the body, and nearly equal in size to 

 those observed over the limbs. On the abdomen, and inferior surface 

 of the tail, the scales are the largest, and strongly carinated, as also 

 under the limbs. The latter are slender and elongated ; the fingers 

 and toes being unequal, and of slender appearance. 



The coloration of this species is uniformly blue or green ; sometimes, 

 blue-spotted, upon a green ground ; the tail being posteriorly brown, 

 spotted, or else semi-annulated wdth black. 



Log. — Singapore. 



Genus AMPHIBOLURUS, Wagl. 



Gen. Char. — Head depressed, subtriangular, rather elongated, covered 

 with small, carinated, subequal, posteriorly acute, or subacute scales. 

 Occipital plate very small. Nostrils lateral, situated beneath the 

 supraciliary ridge. Supralabial plates and temporal scales carinated. 

 Tongue fungoid, narrow, anteriorly notched, or bifid. Compressed 

 and cutting teeth on the sides of the jaws, and subconical incisors 

 anteriorly. Auricular apertures large, simple, or subdenticulated, 

 with the tympanum near the surface. Sides of neck with longitudi- 

 nal folds ; a pectoral fold, simple. Nape and back more or less dis- 

 tinctly crested. Dorsal scales heterogeneous, imbricated, and cari- 

 nated ; abdominal scales subequal and carinated also. Femoral 

 pores in the male sex only ; no preanal pores in either sex. Limbs 

 moderately developed ; five fingers and five toes, simple, compressed, 

 unequal. Tail slender, very long, and tapering, depressed at the 

 base, over which the dorsal crest tapers away. Coloration : brown 

 or yellowish-brown, with irregularly transverse and dark bands 

 or fasciae. 



Syn. — Amphiholurus, "Wagl. Naturl. Syst. Amph. 1830, 145.— WiEOM. Herp. 



Mex. I, 1834, 17.— Fitz. Syst. Kept, i, 1843, 83.— Gray, Catal. Liz. Brit. Mus. 1845, 



232. 



i04 



