404 



MR. G. A. BOULENGER ON THE VARIETIES OF 



6. 2- 



Depth of head 10 7 



Fore liuib 29 22 



Hind limb 46 38 



Foot 24 20 



Tail 135 125 



A male specimen is figured on PL XXVII. fig. 9. 



VI.— CORSICA and SARDINIA. 



(Plates XXII., XXVIII., XXIX.) 



In their Lizards, as in many other animals, Corsica and Sardinia show much in 

 common. The presence in the former island, as well as in Elba, of the var. campestris, 

 undistinguishable from that of Northern and Middle Italy, points to its former 

 connection with these parts of the Peninsula ; and I would regard the other varieties 

 found in Corsica (guadrilineata and bedriagce) as directly derived from the typical form 

 of the wall-lizard through the var. brueggemanni. Sardinia appears to have been 

 stocked from Corsica, possessing, in addition to the var. guadrilineata, a larger form, the 

 true var. tiliguerta, which is particularly closely related to the var. bedriagce, the latter 

 appearing to be nearly completely connected, so far as its characters are concerned, with 

 the still more extreme form described by Peracca as L. sardoa. Although owing to its 

 general appearance the true tiliguerta has usually been confounded with the var. serpa 

 of Southern Italy and Sicily, the frequent greater elongation of the parietal shields, 

 which, as a rule, do not touch the upper postoculars, is a character which approximates 

 it to the var. bedriagce and indicates, in my opinion, closer genetic affinity to the latter 

 than to the former. The relationships and distribution of these various forms may be 

 expressed by the following diagram : — 



N.W. Italy jj, muralis typ. and var. brueggemanni. 



var. campestris. 



Corsica 



Sardinia 



•var. bedriagcu. 

 var. quadrilineata. 

 loa. 

 var. tiliguerta. 



As mentioned above, the var. bedriagce, isolated on the mountains of Corsica (700 to 

 1200 metres), finds its nearest allies in some specimens of the var. brueggemanni from 

 the Ligurian coast, which, as pointed out by Eimer and by Camerano, are remarkable 

 for their strongly depressed head and reticulate markings. I have also drawn attention 



