Lacerta. 145 



an assumption, and I therefore look upon L. derjugini and L. vivipara 

 as probably independently derived from the same original stock, 

 evolved out of the primitive form of L. agilis, the former approaching 

 the typical L. muralis in another evolutionary series. 



I am indebted to M. Nesterov for the specimens from Mechelripsch 

 and to M. L. Lantz for the others. 



14. LACEETA PEATICOLA. 



Lacerta praticola, Eversm. N. Mem. Soc. Nat. Mosc. iii, 1834, 

 p. 345, pi. XXX, fig. 2 ; Kessler, Tr. St. Petersb. Nat. Soc. viii, 1878,. 

 p. 156; Boettg. in Eadde, Eaun. Elor. Casp. Geb. p. 36 (1886); 

 Bedriaga, Abh. Senck. Ges. xiv, 1886, p. 367 ; Bouleng. Cat. Liz. iii, 

 p. 25 (1887) ; Boettg. Ber. Senck. Ges. 1892, p. 139 ; Mehely, Math. 

 Nat. Ber. TJng. xii, 1894, p. 255 ; Bedriaga, Zool. Anz. 1895, p. 261 ; 

 Mehely, Zool. Anz. 1895, p. 474; Kiritzescu, Bui. Soc. Sc. Bucur. x, 

 1901, p. 313 ; Nikolsky, Herp. Eoss. p. 124 (1905) ; Lehrs, Festschr. 

 E. Hertwig, ii, pi. xiv, fig. 7 (1910) ; Schreib. Herp. Eur., ed. 2, p. 508 

 (1912) ; Kowatcheff, Herp. Faun. Bulg. p. 29 (1912) ; Nikolsky, 

 Herp. Caucas. p. 65 (1913) ; Tzarewsky, Trav. Soc. Nat. Petrogr. 

 xliii, 4, 1914, p. 24; Lantz & Cyre'n, Ann. & Mag. N. H. (9), iii, 

 1919, p. 28. 



Lacerta vivipara, var. stenolepis, Nikolsky, Ann. Mus. Zool. Ac. 

 St. Petersb. xvi, 1911, p. 1, and Herp. Caucas. p. 64. 



Lacerta praticola pontica, Lantz & Cyren, t.c. p. 30. 



Form intermediate between L. vivipara and L. muralis typica. 

 Head small. If to If times as long as broad, its depth equal to the 

 distance from the anterior corner of the eye to the tympanum, its 

 length 3f to 4^ times in length to vent in males, 4J to 6 times in 

 females ; snout obtuse, as long as or a little shorter than postorbital 

 part of head ; cheeks not swollen. Pileus If to 2 times as long as 

 broad. Neck a little narrower than the head. The hind limb reaches 

 the elbow or the axil in males, the wrist in females. Foot 1^ to- 

 ly times length of head. Digits scarcely compressed. Tail cylin- 

 drical, tapering from the base, If to nearly 2 times length of head 

 and body. 



Nostril pierced between three (exceptionally four) shields. Eostral 

 not touching the nostril ; suture between the nasals short or very 

 short ; frontonasal broader than long, broader than the internarial 

 space ; suture between, the prefrontals usually very short,* sometimes. 



* Frontonasal in contact with the frontal in a female from Comana Forest. 



10 



