200 MR. G. A. BOULENGER ON THE 
Measurements (in millimetres) :— 
oe oe 9. 
Mleti. Mt. Fatguss. Dariel Gorge. 
From end of snout tovent . .... . 53 55 54 
a =. 5 LOTITO eee 20 22 19 
eneth\of itead! <. ..\ Ay .c nvm nla aie 14 14 13 
Wadthiof head ° .; fas) 32 eee renee 8 9 8 
Depthiof head ) .3.° 49%," Sasa eee eee 7 7 6 
Horeimb:s i Ge) Ces eee 18 19 19 
Hind limb. 4c. 8-8) Gee ae eee 29 29 27 
Hooty fc. B-Ab ig ee. ys 16 16 15 
Maal hus Pee oak. Reet et rr OD 110 100 
In form, scaling, and coloration, this variety has much in common with the Spanish- 
Portuguese var. bocagii, the resemblance being particularly striking if the specimen 
from Mt. Fatguss be compared with some from the mountains of Portugal. .I may 
add that a male from the Loroya Valley, near Madrid *, has the caudal scales more 
pointed than in one from Mleti. 
In a recent article in Russian, a translation of which I owe to the ever-ready help 
of my friend Dr. de Bedriaga, Kikolsky accepts Méhely’s L. caucasica as a species, and 
points out the following characters as sufficient to separate it from Z. saxicola, which 
includes the Asiatic varieties mentioned above :— 
Collar denticulate. But he admits that some of his LZ. saxicola have a feebly denti- 
culate collar, and that in numerous examples of ZL. caucasica the character is not 
particularly well marked, so that he cannot endorse Méhely’s expression “ grob 
gezahnelt.” 
Upper caudal scales pointed behind. This I find to be often very ill-defined, and 
Méhely himself admits “ bei den Stiicken von Mleti 6fters noch schwach.”’ 
Outer ventral plates narrower than the inner. ‘This supposed difference is not 
borne out by any of my specimens; the outer plates are in fact broader in proportion 
than in a specimen of L. saxicola from the Crimea. 
Dorsal scales strongly conver. Not so in the specimen from Mt. Fatguss. 
Length of tail usually less than twice the distance from the gular fold to the vent. 
Both the male specimens of which I give measurements would be exceptional. 
Body broader and shorter. This is not borne out by a comparison with certain 
individuals from the Crimea, Asia Minor, and Persia. 
Although they may suffice for the justification of a variety, the characters on which 
LL. caucasica rests are too inconstant to warrant specific distinction. 
* Mr. Degen has prepared the skull of one of these specimens, and it shows an incomplete ossification of 
the supraocular region as in L. caucasica. 

