2 ME. G. A. BOULENGEE ON LIZAEDS 



which also happens to be the type of the genus, and its ally, L. parva. The extra- 

 ordinarily great variations, individual and geographical, to be found in Lacerta acjilis 

 are a subject deserving of renewed study on a large material. I will, therefore, first 

 give an account of Lacerta agilis and L. parva before passing on to the descriptions 

 of the allies of Lacerta muralis. 



A division of the very homogeneous genus Lacerta into minor groups is a matter of 

 great difficulty, and has baffled the efforts of those best qualified by a long and patient 

 study to enlighten us. Leaving aside the views of Prof. L. von Mehely, as embracing 

 for the present but a limited number of forms, the treatment of which I have criticized 

 on previous occasions *, I will refer here only to the two complete schemes of 

 classification which have been hitherto proposed, by Dr. J. de Bedriaga and Dr. F. 

 Werner respectively. 



1. Bedriaga, 1886 f:— 



Group I. L. ocellata Daud., viridis Laur., princeps Blanf., agilis L., with the inter- 

 mediate forms L. pater { = ocellata) and paradoxa (:=agilis). 



Group II. L. muralis Laur., brandti De Fil., danfordi Gthr., Icevis Gray, grceca Bedr., 

 oxycepliala D. & B., bedriagce Camer., depressa Gamer., taurica Pall., pclo- 

 ])onnesiaca Bibr., dugesi M.-Edw., galloti D. & B., atlantica Peters & Doria, 

 perspicillata D. & B. 



Group III. L. vivipara Jacq., praticola Eversm. 

 Group IV. L. echinata Cope. 



A fifth comprises L. tessellata Smith and tcenioldta Smith, which, with Bcttaia 

 delalaiidii M.-Edw., I place in the genus Nucras Gray. 



2. Werner, 1904 | :— 



Group I. L. muralis Laur., Icdriagce Camer., depressa Camer., mosoreiisis Kolomb., 



o.rtjcepihala. D. & B., anatolica Wern., cappadocica Wern. (a Latastia), gra'ca 



Bedr., davfordi Gthr., Icevis Gray. 

 Group II. L. serpa Raf., littoralis Wern., ionica Lehrs, taurica Pall., pelopon- 



nesiaca Bibr. 

 Group III. L. hispanica Stdr., halearica Bedr., intyusensis Bosca, lilfordi Gthr., 



dugesi M.-Edw., atlantica Peters & Doria, galloti D. & B., simoniji Stdr. 



Group IV. L. agilis L., parva Blgr., viridis Laur., ocellata Daud. 



Group V. (branching off from Group I.). L, praticola Eversm., vivipara Jacq., der- 



juginii Nik. 



* Ann. & Mag. N. H. (7) xx. 1907, p. 39, and (S) v. 1910, p. 247. 

 t Abh. Senckeub. Ges. xiv. p. 38. 

 + Zool. Ani;. xxyii. p. 254. 



