232 Lacertidse. 



to 29 femoral pores ; 26 to 31 lamellar scales under the fourth toe ; 

 head and body very strongly depressed ; often 5 upper labials anterior 

 to the subocular ; anterior upper temporal shield often in contact with 

 the fourth supraocular. — Mountains of Corsica. 



Var. sardoa, Peracca. — Scales smooth, 64 to 82 across the body ; 21 

 to 31 femoral pores ; 26 to 31 lamellar scales under the fourth toe ; 

 head generally narrower than in the preceding ; rostral nearly always 

 in contact with the frontonasal. — Mountains of Sardinia. 



The last two varieties are, in my opinion, to be regarded as parallel 

 adaptations to life at great altitudes. The former may have been 

 connected by intermediate forms, now extinct, with the var. insulanica, 

 and the latter with the var. tiliguerta, or both may have been derived 

 from the var. tiliguerta, which, though now absent from Corsica, 

 perhaps existed in the past on all the Tyrrhenian Islands.* 



Var. BEUEaO-EMANNI. 



Lacerta muralis, var. nigriventris, Eimer, Zool. Stud. Capri, ii, p. 30 

 (1874). 



Lacerta muralis, var. hrueggemanni, Bedriaga, Arch. f. Nat. 1879, 

 p. 304, pi. xvii, fig. 1, Bull. Soc. Zool. Prance, 1879, p. 219, and Abh. 

 Senck. Ges. xiv, 1886, p. 247 ; Bouleng. Cat. Liz. iii, p. 30 (1887), Tr. 

 Zool. Soc. xvii, 1905, p. 380, pi. xxii, figs. 1-3, and xx, 1913, p. 148, 

 pi. xvii, figs. 1-5. 



Lacerta muralis reticulata nigriventris, Eimer, Arch. f. Nat. 1881, 

 p. 355. 



Lacerta muralis, var. nigriventris, part., Schreib. Herp. Eur., ed. 2, 

 p. 411 (1912). 



This variety is completely connected with the typical form, and the 

 proportions do not differ, nor does, as a rule, the shape of the head, 

 although it may be very strongly depressed — its depth, in certain 

 males from Liguria, not exceeding the distance between the eye and 

 the tympanum.f The hind limb reaches the shoulder or the collar in 

 males, the axil in females. 



The rostral does not touch the nostril,J and is sometimes in contact 

 with the frontonasal, forming a suture § ; the frontal is often shorter 



* Cf. Boulenger, C. R. Ac. Sci. Paris, olxiv, 1917, p. 803. 



t Such, specimens (from Genoa) may have the body much flattened, twice as 

 broad as deep. 



X Enters the nostril in a male from Tuscany. 



§ In single specimens from Sestra Ponente, Portofino, Livorno, Bellagio, and 

 Lerici. 



