%<3,oC\ 



Z.S 



[KvtracieJ from the 'Transactions of the Zoological Society of London,' "Vol. xxi, Part i. June, 1916.] 



I. On ilw Lizards allied to Lacerta rauralis, with an Account q/'Lacerta agilis 

 and L. parva. L'l/ G. A. Boulexgek, F.R.S., F.Z.S.* 



[Received January 7, lOlU; Read April 4, 1916.] 



(Plates I.-VII., and Text-figures 1-12.) 



Indfa. 

 Vauiation : P^S® 



Variation in Species of Lacerta ; Lines of Evolution 1 



Taxoxomy : 



Revision of Geuus Lacerta : L. aijiJls, L. parva, and Species allied 



to L. uiuralis = ^ 



SvSTEMATlc : 



O'allotia, Ccntromastu; nn. nn. for Sections of the Genus Lacerta . . 3 



Introduction. 



In two previous contributions to tliese 'Transactions ' f, I have dealt in detail with 

 Lacerta miiralis, and I have now extended my observations to the species that cluster 

 around this highly polymorphic species. But, in order properly to understand the 

 l)hylogenetic relationships of the members of tliis group, it is necessary to refer to two 

 species belonging to another section of the genus, because 1 regard them as tiie most 

 primitive, the keystone to the study of all the species of Lacerta, viz. Lacerta agilis, 



* Tublished by permission of the Trustees of the British Museum. 

 t Vol. xvii. 1U05, p. aSl, and vol. xx. 1913, p. 13?. 



VOL. XXI.— I'.uiT I. No. 1. — June, 1916. B 



