YAELETIES OF THE WALL-LIZAED. 



141 



sometimes appealed to in justification of specific distinction among the Wall-Lizards, 

 it is worthy of note that the typical form, which ranks as a small race, on an average 

 may reach a length of 72 mm. without the tail in both sexes, whilst in the largest 

 Wall-Lizards examined by me this length does not exceed 90 mm. in males 

 (var. serpa), and 82 in females (var. bedriagce), such specimens being regarded as 

 exceptionally large. 



The female is remarkable for the very short and broad, nearly smooth caudal scales. 



A male specimen caught at Acliard, near Bordeaux, by Mr. Edward Britten, and 

 presented by him to the British Museum, is remarkable for having the anterior nasal 

 in contact with the loreal, and the anterior temporal reaching the upper surface of the 

 head and broadly in contact with the fourth supraocular (PL XVI. fig. 3). 



Achard cj 



1. 



60 



52 



5. 

 20 



6. 

 19 



7. 

 24. 



It has 5 upper labials on the right side, 4 on the left. 



I have represented the caudal scales of three specimens of the typical form to show 

 to what extent their shape and degree of keeling may vary according to individuals, 

 and in order to warn against such a character being used for the definition of species. 

 In other forms I have observed similar individual difi"erences, though perhaps not to 

 the same extent. 



These scales are taken from the left half of the posterior part of the anterior fourth 

 of the intact, unreproduced tail. 



Test-fiff. 2. 





Caudal scales of L. nvuralis. 

 A, B. Denee, Prov. Namur, Belgium ; C. Baden, near Vienna. 



Sensory pits near the posterior border of the caudal scales are often very distinct 

 in the typical L. muralis. 



I have already expressed my agreement with Elmer's theory as to the modifications 

 of the pattern of markings in these lizards, viz., that the longitudinally streaked forms 



