Mr, A. W. E. O'Shaughnessy on Norops. 191 



The specimen in the British Museum is said to have come 

 from South America. 



2. Norojys duodecim-striatus. 



Draconura duodeccm-strtata, Berthold, Abhandlungen der Koniglichen 

 Gesellschaft der Wissenschaften zu Gottingen, 1843, p. 62. 



Draconura Beriholdii, Fitzinger, Systema Reptilium, 1844. 



Norops macrodaetylus, Ilallowell, Proc. Ac. Nat. Sc. Pliilad. 18oG, 

 p. 222. 



Anolis auratus, Peters, Bericlite iiber die Verhandlungen der Akad. Ber- 

 lin, 1863, p. 135. 



Head somewhat depressed, pointed, covered with regular 

 rather flat shields, those of the snout only minutely tricari- 

 nate, the rest smooth ; one series of long- narrow scales be- 

 tween supralabials and eye ; occipital plate large, oval, larger 

 than any of the other head-shields. Toes not dilated. Fore 

 limbs, when laid forward, reaching to nasal opening, hind- 

 limbs to ear-opening. Tail about thrice the length of the body. 

 Coloration. Head, back, and upper part of tail white above (pro- 

 bably pale golden when alive) ; sides brown, white-spotted ; 

 a white stripe extending from eye, over tympanum, along the 

 side of head and neck, and the whole length of the body, be- 

 coming lost on the tail. 



The general shape of N. 12-strtatus is slenderer than that 

 of auratus. The head is longer and narrower, its width at 

 the posterior broadest part being contained exactly twice in 

 the length of the same ; the muzzle is more pointed than in 

 that species. The upper surface of the head is somewhat 

 flattened rather than convex. The scales of the muzzle only 

 are minutely but distinctly tricarinate ; those covering the rest 

 of the upper surface of the head are smooth. No projecting 

 ridge bounds the inner semicircular border of the supraorbital 

 space, which is composed of a group of large smooth plates, 

 more numerous than in auratus , and a mass of minute granular 

 ones. The upper edge of the orbit is rather sharp, and extends 

 down to the nostril much as in that species. The occipital 

 plate is large, oblong, much larger than any other plate on the 

 head. Ear-opening smaller. There is only one scries of 

 elongated scales between the supralabials and the eye. 



The longitudinal line of the back is much flattei than in 

 N. auratus, and the surface of the back is wider, the body being 

 less compressed. The scales on the back, belly, and sides are 

 similar to those of the latter species. The tail, somewhat flat- 

 tened above at its commencement, does not present the qua- 

 drilateral form or the compression mentioned by Dumeril and 

 Bibron, gradually becoming more rounded; it is covered with 

 keeled scales like those of the back. 



14* 



