52 MR. G. A. BOULENGEE ON LIZAEDS 



as first shown by Bedriaga in 1883, chiefly in the larger head in the male, the 

 non-serrated collar, the truncate or very indistinctly pointed caudal scales, and the 

 nearly constant absence of granules between the supraoculars and the superciliaries. 

 The latter character and the strong palatal dentition separate it from L. mnralis. 



In some respects (stronger palatal dentition, absence of granules between the 

 supraoculars and the superciliaries, more pronounced striation) this species is phylo- 

 genetically less advanced than L. taurica, but in all others it has evolved further from 

 the hypothetical ancestral form. 



For reasons explained above (p. 12) I look upon the coloration of the young as 

 the most primitive in the L. muralis group, as in some specimens the original five 

 light dorsal streaks are preserved on the nape ; but on the sides the light streaks 

 are reduced to one, the median lateral of L. agilis. 



Lacerta chlokogaster. 



Lacerta muralis, var. defilippii, part., Boettg. in Radde, Faun. Flor. Casp.-Geb. p. 44 (1886). 



Lacerta clilorogaster Bouleng. Proc. Zool. Soc. 1908, p. 934, pi. Ixvii. 



Lacerta boettgeri Mehely, Ann. Mus. Hung. vii. 1909, p. 583, pis. viii. fig. 9, xxii. figs. 5 & 6, and 



xxiii. fig. 6 *, and Zool. Anz. xxxv. 1910, p. 593 ; Nikolsky, Ann. Mus. Zool. Ac. St. Petersb. 



XV. 1910, p. 497. 

 ? Lacerta caucasica, var. tenuis Nikolsky, t. c. p. 496. 



Head and body moderately depressed. Head rather large in males (rarely 4 times 

 in length to vent), 1^ to 1|- times as long as broad, its depth equal to the distance 

 between the anterior corner or the centre of the eye and the tympanum ; occipital 

 region convex ; snout obtuse, as long as postocular part of bead : cheeks not much 

 swollen in the male ; length of pileus about twice its width. Neck sometimes as 

 broad as head, usually narrower. Hind limb reaching the shoulder or the collar in 

 the male, the elbow or the axil in the female ; foot longer than the head. Tail 

 cylindrical, about twice as long as head and body. 



Nostril pierced between the nasal, a postnasal, the first upper labial, and sometimes 

 the rostral. Nasals forming a suture behind the rostral ; frontonasal broader than 

 long ; frontal as long as or a little shorter than its distance from the end of the snout, 

 14 to 1| times as long as broad, as broad, behind, as the principal supraoculars, some- 

 times in contact with f or narrowly separated from the first supraocular; parietals 

 li to 1| times as long as broad, usually not in contact with the upper postocular if, 

 the outer border straight and oblique or more or less emarginate in front for 

 the reception of the upper temporal ; occipital usually shorter and broader than the 



* Lacerta boettgeri Mehely, Aim. ilus. Hung. v. 1907, p. 8S, is a mere nomen nudum. Xo definition, not 

 even an indication of the habitat, 

 t In 4 specimens out of 23. 

 t 3 exceptions out of 23 specimens. 



