176 



Lacertkhe 



varieties is a matter of the greatest difficulty, if a conscientious adherence 

 to facts is never to be departed from. The grouping "of the varieties 

 is also very perplexing, and in the following attempt at some sort of 

 arrangement special consideration has been given to the geographical 

 distribution, in view of what I hold to be examples of parallel evolution 

 and convergence. A list of the principal varieties will show the 

 arrangement which I have adopted as the most practical for the 

 expression of their mutual affinities. The five groups radiate from 

 the typical form and in each the variety which I regard as annectaut 

 to it is ]>laced first on the list. 



Group I ^ 



Group II 



Group III 



Group IV 



1. var. fiumana, Werner,* p. 179. 



2. „ lissana, Werner, p. 185. 



3. ,, melisellensis, Braun, p. 187. 



4. „ serpa, Eaf.,* p. 190. 



5. ,, campestris, de Betta, p. 193. 



6. „ albiventris, Bp., p. 199. 



7. „ liieroglyphica, Berth., p. 208. 



8. „ erhardi, Bedr., p. 211. 



9. ,, quadrilineata, Gray, p. 215. 



10. „ filfolensis, Bedr., p. 219. 



11. „ liJfordi, Gthr.,* p. 225. 



12. „ pityusensis, Bosca, p. 228. 



13. „ brueggemanni, Bedr., p. 232. 



14. ,, nigriventris, Bp., p. 237. 



15. ,, insulanica, Bedr., p. 241. 



16. „ tiUguerta, Gm., p. 243. 



17. „ hedriagie, Gamer.,* p. 249. 



18. ,, sardoa, Peracca,* p. 252. 



19. ,, liolepis, Blgr., p. 256. 



20. „ hispanica, Stdr.,* p. 259. 



21. ,, vaiicheri, Blgr., p. 261. 



22. „ bocagii, Seoane, p. 262. 



23. „ monticola, Blgr.,* p. 268. 



gamete having to fit exactly the female gamete, as foi- a key to turn in the 

 lock. An examination of the male genital glands is, in his opinion, in most 

 cases sufficient to decide whether a given form should rank as a species or as a 

 variety, and he has, at my request, applied this test to specimens of L. muralis 

 typica and var. nigriventris, albiventris, and tiUguerta, without finding the 

 slightest difference between them, whilst observing another state of things 

 in L. viridis, with which he has compared them. 



