142 Lacertidas. 



the exception of the enlarged shield in front of the preanal* and the 

 blue colour of the lateral ocelli, there is not a character which does 

 not also occur in L. vivipara, although not actually in combination.f 

 I attach no importance whatever to the " scutum subnasale."+ The 

 system of coloration agrees perfectly well with that of L. vivipara.^ 



More specimens are needed to show whether specific rank should be 

 accorded to this form or whether it should not be regarded as a variety 

 of L. vivipara. 



13. LACEETA DEEJIJGINI. 



Lacerta derjugini, Nikolsky, Ann. Mus. Zool. Ac. St. Petersb. iii, 

 1898, p. 284, and Herp. Eoss. p. 126, pi. i, fig. 5 (1905) ; Mehely, 

 Ann. Mus. Hung, vii, 1909, p. 572, pi. xxi, figs. 3 and 4 ; Schreib. 

 Herp. Eur., ed. 2, p. 395 (1912); Nikolsky, Herp. Cauc. p. 55 

 (1918) ; Tzarewsky, Trav. Soc. Nat. Petrogr. xiiii, 4, 1914, p. 24. 



Body moderately depressed. Head small, 1^ times as long as broad, 

 moderately depressed, its depth equal to the distance between the 

 centre of the eye and the tympanum, its length 3f to 4i times in 

 males, 4^ to 5-^ times in females, in length to vent ; cheeks feebly 

 swollen ; snout obtuse, shorter than posterior part of head. Pileus 

 If to If times as long as broad. Limbs short, the hiud limb reaching 

 the elbow of the adpressed fore limb or the axil in males, the wrist in 

 females. Eoot as long as head or a little longer. Digits scarcely 

 compressed. Tail thick, 1^ to If times length of head and body. 



Nostril pierced between three shields. Eostral not touching the 

 nostril, forming a suture with the frontonasal, which is broader than 

 long and a little broader than the internarial space ; prefrontals 

 usually in contact with each other ||; frontal hexagonal, not much 



* As appears sometimes, as an individual departure from the normal, in 

 L. agilis and the typical L. muralis. I have, however, not met with it in any 

 of the numerous specimens of L. vivipara examined ; there is occasionally an 

 azygos anterior preanal, but then it is small. 



t In a female from Berlin the interparietal and occipital are nearly in the 

 same proportion to each other ; in another from the same locality, with 3-2 

 granules between the svipraooulars and the superciliaries, the parietal scarcely 

 reaches the upper postooular and the frontal is broader anteriorly than 

 posteriorly. 



t Occurs occasionally in L. agilis and L. vivipara (male from Eussian Lapland, 

 females from Hindhead and Ostend,male and female from Korsakoff, Sachalien). 



§ Especially of the females from damp localities in the Alps, as opposed to 

 those from the plains of Switzerland, which Fatio (Vert. Suisse, iii, p. 86) 

 compares to L. agilis. 



II Separated by an azygos shield in a female from Borjom. 



