32 MK. G. A. BOULENGEE OX LIZAKDS 



dorso-laterals, as in the typical form, whilst in othex's, often from the same locality, the 

 dorso-laterals are only a little broader than the mid-dorsals, and as this peculiarity is 

 usually accompanied by an increase in the number of scales across the body (45 to 52), 

 the scaling of such specimens does not differ in any way from that of a typical 

 L. viridis. The ventral plates are usually in 6 rows ; if in 8, the outer plates are 

 usually very narrow ; in some specimens the differentiation between the ventral plates 

 and the lateral scales is quite abrupt. 



Prseanal plate usually smaller than in the typical form (its length equal to or less 

 than its distance from tlie anterior femoral pores), bordered by two semicircles of 

 scales, two of which in front of the plate are often much enlarged and plate-like *, as 

 figured <m PI. II. fig. 8, or even fused to one plate as large as the prseanal, as in the 

 type figured by Eichwald. 



Femoral pores rather more numerous, 12 to 18 on each side f, usually 13 to 16. 



30 to 36 caudal scales in the fourth or fifth whorl. 



Young, brown above, constantly with three light, sometimes black-edged, well- 

 defined longitudinal streaks ; the median begins behind the occipital shield and ends 

 on the base of the tail, the lateral usually extends from the fourth supraocular to near 

 the end of the tail, or, losing its connexion with the superciliary border, from the 

 outer third of the parietal shield. Three or four whitish lateral streaks, or series of 

 whitish black-edged ocellar spots on each side, the two upper originating on the side 

 of the head, as figured on p. 13. 



These markings usually persist in the adult, with the addition of a series of large 

 squarish or irregular dark brown or black spots between the light dorsal lines (PI. II. 

 figs. 5, 6), which may be edged with black (PI. II. fig. 4). In males, which are often 

 green all over, and permanently, including the light dorsal streaks, the spots may be 

 accompanied by numerous black dots (PI. II. fig. 3). Some specimens lose more or 

 less completely the markings and are uniform green above, or green finely speckled 

 with black as we often see in L. viridis. Females are usually grey or brown, but 

 sometimes green hke the males j. A female from Minussinsk, Yeniseisk (PI. II. 

 fig. 7) is pale reddish brown, with a yellowish vertebral streak and a bluish-grey 

 dorso-lateral band ; only scanty vestiges of the ocellar spots on the sides. Schreiber 

 describes a var. concolor, uniform olive-brown. 



Lower parts yellowish or greenish white, or yellow, uniform or dotted with black, 

 the dots usually more profusely distributed in males than in females. 



* " Scuta analia 1-3," Bedriaga, I. c. 1886. 



t Up to 20 according to Rathke ; 10 to 16, usually 12 to 15, according to Cugunov, who has tabulated 

 the variations in 89 specimens from the Ilauskaia district on the Trans-Siberian Jvailway. 



t According to Bedriaga, wholly green specimens (var. doniensis Bedr.) are so in both sexe-; in Southern 

 European Russia, whilst in Transcaucasia and in the Kirghiz Steppes the females are brown. A similar 

 colour-dimorphism in females, according to districts, appears to occur also iu L. viridis. 



