Lacerta. 37 



Section I {Lacevta, s. sir.), p. 37. L. ayilis, L., parva, Blgr., 

 viridis, Jjnur., princeps, Blauf., ocellata, Daud. 



Section II (GaUoiia, B1<j,t.), p. 109. L. atlantica, Peters & Doria, 

 cxsarh, Lelirs, ijaUoti, D. it B., dekVuii, Sclienkel, siinonyi, StJr. 



Section III {Zootoca, Wagl.), p. 126. L. vivipara, Jacq., fraasii, 

 Lehrs, derju(jlni, Nik., pratlcola, Eversni., vauereselli. Torn. 



Section IV (Po(/t)frr(V, \Vairl.)>P- 1'"***. L. taurira, l^aM., peloponnesiaca, 

 Bibr., muralis, Laur., chloro<jaster, Uls^r. , jackxoaii, Blgr., brandtii, De 

 Fil., Imvis, Gra,y, jayakari, Blgr., danfordii, Grtlir., oxycephala, D.&B., 

 mosorenms, Kolomb., dugesii, M.-Edw. 



Section V {Getitromastiv, Blgr.), p. 331. L. echinata, Cope. 



Section VI {Thetia, Gray), p. 335. L. peispicillata, D. & B. 



The first section^ corresponds exactly to Group I of Bedriaga (1886), 

 and Group IV of Werner (1906) ; the inter-relationships between its 

 components have lieen recognised by all recent authors, and are so 

 obvious that no doubt can be entertained as to the species included 

 constituting a natural association. But the group is hai'dly capable 

 of definition, so closely does it merge into the three following. 



The second section, confined to the Canary Islands, I have no doubt 

 viras derived from some now extinct form closely related to L. ocellata, 

 var. pater, inhabiting N.W. Africa, exceptional specimens of which still 

 show traces of light longitudinal streaks ; the two postnasals of 

 L. ocellata have been reduced to one. 



The third section, which I regard as directly derived from L. ag'dis, 

 has been recognized by Bedriaga and by Werner. It should be kept 

 distinct from the L. muralis association, although approaching very 

 closely L. muralis, vars. breviceps and caucasica. 



The fourth section is so completely linked wdtli the first through L. 

 ^agilis, parva, taurica, pelopomiesiaca, and brandtii, as to preclude a 

 rigid definition. It constitutes a natural association of forms more or 

 less adapted for climbing. 



The last two sections each contain a single perfectly isolated species. 



Section I. Lacerta, s. str. — Transverse series of ventral plates with 

 notches between the plates,* longitudinal series 6 to 10 in number ; 

 collar sti'ongly serrated ; usually two superposed postnasals, or one 

 postnasal and two superposed anterior loreals ; femoral pores 10 to 22 ; 

 subdigital lamellae 16 to 31 under the fourth toe ; pterygoid teeth. 



* This character is most marked iu L. ag'dis, least in L. ocellata, some specimens 

 of which might almost fall under the definition of the foUowin;^ section but for 

 the presence of two superposed postnasals. 



