YAEIETIES OF THE WALL-LIZAED. 151 



Measurements (in millimetres) : — 



1. 2. 3. 4. 5. 6. 



From end of snout to vent .... 80 72 68 62 70 80 



„ „ „ fore limb . . 34 28 26 22 27 35 



Length of head 22 19 18 14 19 23 



Width of head 15 12 13 9 12 16 



Depth of head 10 10 9 7 10 10 



Fore limb 31 25 23 20 24 33 



Hind limb 47 41 39 34 37 47 



Foot 27 22 20 17 20 26 



1. cj, type, Pianosa (Bedriaga Collection). 2-3. cJ^Pianosa. 4. ? , Pianosa. 5. (J, Scuola, 

 near Pianosa (Bedriaga Collection). In column 6 I have added, for comparison with no. 1, 

 the measurements of a large male of var. bedriaga from Bastelica, one of the types, in the 

 Bedriaga Collection. 



This var. insulanica may be regarded as completely connecting the var. brueqgemanni 

 with the var. tiliguerta, differing from the latter in having the belly more or less 

 spotted, at least on the sides. As I have previously pointed out (Tr. 1905, p. 384, 

 footnote), the smaller var. hrueggemanni occurs on Elba, and specimens from S. Piero, 

 near Elba, are in the Werner Collection. 



Eegarding, with Bedriaga, the Pianosa lizard as also nearly related to the Corsicau 

 var. ledriagoe, we may turn to Mehely's latest paper (1909, p. 486) to see what are 

 the characters which, according to him, justify the specific separation of the latter 

 from L. muralis, of which he regards L. hrueggemanni as a variety. 



Leaving out the cranial characters, which are likewise inconstant (see above, p. 136), 

 but with which I do not propose to deal at present, the following are the points on 

 which this author lays greater stress to show that L. ledriagoe, or reticulata as he calls 

 it, cannot be regarded as a race of L. muralis, but is unquestionably entitled to rank 

 as a species pertaining to a quite different group. 



1. The robust, stout hahitus. — This is true only of males, and a comparison of the male 

 figured by me (Tr. 1905, pi. xxix. fig. 7) with one of L. insulanica in the present 

 paper (PI. XVIII. fig. 1) shows how slight such a difference really is (see also 

 the comparative measurements given above). Besides, Mehely includes in the 

 same species L. sardoa, which, according to his own definition, is more slender than 

 L. hedriaga;. One does not see, therefore, how the robust, stout form can be appealed 

 to in justification of the specific distinction. Bedriaga (see above, p. 149) alluded 

 specially to the stout form of the Pianosa lizard. 



2. The short frontal. — It may be quite as short in L. insulanica, and it is not 

 at all short in L. sardoa (see Tr. 1905, pi. xxviii. figs. 8 & 9). Big, heavy 

 males of var. hrueggemanni and Jilfolensis often have a short frontal, much shorter 

 than its distance from the end of the snout. There is nothing in this character. 



VOL. XX. — PAKT 111. No. 3. — February, 1913. Y 



