Lacerta. 255 



Habitat. — This lizard appears to have a very restricted habitat on 

 the mountains of Sardinia. Most of the specimens, including the 

 type, were obtained on Mt. G-ennergentu. Three specimens, from 

 Mt. Limbara, are preserved in the Florence Museum. 



It is so closely allied to L. hedriagee that it was first held to be 

 identical with it by Mehely. In his latest contribution the same 

 author regards it as a geographical variety, a view in which I concur. 

 The two forms can only be distinguished by a combination of 

 characters, not one of which is constant. It is not improbable, how- 

 ever, that the resemblance between the two lizards is a case of 

 parallelism and that both have been independently derived, as 

 mountain forms, from a common ancestor, of which the var. tiliguerta 

 is the survivor. 



Group IV. — Spain and Portugal, North- West Africa. 



A few varieties are here grouped together, which are closely allied 

 to and no doubt derived from the typical form, from which some of 

 them are barely distinguishable and with which most agree in the 

 absence of vivid green colour. In the first two varieties a dark verte- 

 bral streak or series of spots is primarily present, whilst it has been 

 lost in the others. In addition to this character, the following defi- 

 nitions will help in their identification. 



Var. liolepis, Blgr. — Head moderately depressed ; scales smooth or 

 faintly keeled, 51 to 65 across the body ; upper caudal scales smooth 

 or feebly keeled ; collar-plates usually very small ; 15 to 22 femoral 

 pores ; 21 to 27 lamellar scales under the fourth toe ; masseteric shield 

 usually very small or absent. Prom snout to vent up to 60 millim. — 

 Spain. 



Var. hispanica, Stdr. — Head much depressed, snout acutely pointed 

 scales smooth, 50 to 60 across the body ; collar-plates very small 

 14 to 19 femoral pores ; 25 or 26 lamellar scales under the fourth toe 

 masseteric shield usually absent ; often 5 upper labials anterior to the 

 subocular. Prom snout to vent up to 50 millim. — S. Spain. 



Var. vaucheri, Blgr. — Head moderately depressed ; scales distinctly 

 keeled, 61 to 76 across the body; 13 to 19 femoral pores ; 23 to 28 

 lamellar scales under the fourth toe ; masseteric shield usually present. 

 Prom end of snout to vent up to 62 millim. — S. Portugal and Morocco. 



Var. boeagii, Seoane. — Head more or less depressed ; scales smooth 

 or feebly keeled, 50 to 67 across the body ; 14 to 22 femoral pores ; 

 21 to 29 lamellar scales under the fourth toe ; masseteric shield often 



