186 Mr. A. W. E. O'Shaughnessy on Norops. 



one. This point is precisely the relative length of the limbs, 

 the hinder ones being said to reach only to the margin of the 

 ear-opening— a characteristic of 12-striatus. In the description 

 of the coloration the colours characteristic of the two forms 

 (allowing for alteration in deteriorated specimens) are separately 

 mentioned. 



It is probable, therefore, that the second specimen was one 

 of 12-striatus, and furnished the character of the relative length 

 of the limbs. As regards every other distinctive character the 

 description is that of the other form, as will be seen by this 

 enumeration of distinctive characters only. 



All the scales of the head are said to be keeled : — 



" Celles qui occupent l'intervalle interorbitaire et l'occiput 

 offrent un pen moins de longueur et ne portent la plupart 

 qu'une seule carene. 



" Les regions surciliaires .... pre*sentent vers leur partie 

 centrale, quatre ou cinq plaques. 



"II existe un double rang de grandes ecailles carene*es au-des- 

 sus de la serie des plaques labiales superieures. 



" La queue est environ unefois de plus etendue que le reste 

 du corps. 



u Corps d'un brun fauve dore, avec ou sans bande d'une teinte 

 plus claire sur le dos." 



Dr. Hallowell (Proc. Ac. Nat. Sc. Philad. 1856, p. 222), 

 speaking of the specimens of Norops in the Smithsonian col- 

 lection, says : — " But one species of this genus has been de- 

 scribed, viz. N. auratus, from Surinam and other parts of 

 Guiana. The specimen in our collection, received from the 

 Garden of Plants, is from Mexico. The toes are dilated, but 

 not to so great an extent as in many species of Ariolis." He 

 then proceeds to describe a second " species with the same ge- 

 neric characters, but in which the toes are totally destitute of 

 any such dilatation." He calls this species N. macrodactylus. 



In the course of his description he says : — " The head is long 

 and narrow, occipital plate quite distinct ; fingers and toes not 

 dilated ; body slender ; upper surface white ; sides brown, 

 white-spotted ; a lateral white stripe extending from beneath 

 the eye along the side of the head immediately above the tym- 

 panum, passing along the side of the neck about a line above 

 the shoulder, and extending the whole length of the side of the 

 body, becoming lost on the tail. 



There is sufficient here to enable one to recognize the 12- 

 striatus of Berthold, of whose previous description he was of 

 course ignorant. The colours are particularly accurate and 

 characteristic of this species, which has quite a different colora- 

 tion from that of auratus, as will be seen by the summary of 



