198 ME. G. A. BOULENGEE ON THE 



Measurements (in millimetres) : — 



1. 2. 



From end of snout to veut 83 70 



„ „ „ fore limb ... 34 27 



Length of head 21 16 



Width of head _ . . . . 16 11 



Depth of head 10 6-5 



Fore limb • . . . 30 25 



Hind limb 42 38 



Foot 22 22 



The largest specimen examined by Mehely, a female from Batum, measures 87 mm. 

 from snout to vent. 



Although one of the most distinct forms of L. muralis, the var. rudis is, however, 

 connected by intermediate specimens with the var. saocicola, as observed by Mehely. 



The specimens figured on PL XXII. are males from Batum (fig. 7), in Dr. de 

 Bedriaga's Collection, and from Tchorok (fig. 8). 



Var. CAUCASicA. 



Lacerta muralis, var. saxicola (non Eversm.) Kessler, Tr. Soc. Nat. St. Petersb. viii. 1878, p. 152. 

 Lacerta muralis, \a.r.fusca, f. praticola, part., Boettg. Ber. Offenb. Ver. Naturk. 1880, p. 91. 

 Lacerta saxicola, subsp. gracilis Mehely, Ann. Mus. Hung. vii. 1909, p. 555. 

 Lacerta caucasica Mehely, t. c. p. 560, pi. xxi. figs. 1 & 2 ; Nikolsky, Ann. Mus. Zool. Ac. 



St. Petersb. xv. 1910, p. 495 ; Lehrs, Festschr, E. Hertwig, ii. p. 234, pi, siv. figs. 4-6 



(1910). 



This form, characterised by a distinctly serrated collar, large gular and dorsal scales, 

 and a low number of femoral pores, connects L. muralis with L. derjugini Nikolsky. I 

 have no hesitation in bestowing on it the name caucasica proposed by Mehely, as two 

 of the specimens examined by me, now in Dr. de Bedriaga's Collection, formed part 

 of the series from Mleti, in the Aragwa Valley, Transcaucasia, originally referred by 

 Boettger to L. praticola, and since made the types of a new species, one of the 

 characters of which is for tlie males to have the femoral pores hardly more developed 

 than the females. This is so in the Mleti specimens here described (PI. XXIII. 

 tig. 3), whilst two males from the summit of Mt. Fatguss, near Vladikaukas 

 (PI. XXIII. fig. 4), part of a series in the St. Petersburg Museum, referred by Nikolsky 

 to L. caucasica, have very strongly developed pores, and would probably have 

 been made the types of a distinct species or subspecies had they been known to 

 Mehely. 



In the specimens examined by me the caudal scales are not markedly pointed, and 

 therefore these specimens could not be determined as L. caucasica by means of 



