On the Affinity of the North- American Lizard-Fauna. 345 



4. Eumeces Schneideri^ Daud. 



Five specimens, three with 26, two with 24 scales roand 

 the middle of the bodj. 



5. Chalcides ocellatuSj Forsk. 



A single specimen, belonging to the var. A (B.M. Cat. 

 Liz. iii. p. 401). 



6. Chammleon vulgaris, Daud. 



Snakes. 



7. Typhlops vermicularis, Merr. 

 8. Tropidonotus natrix, L. 



9. Zamenis atrovirens, Shaw. 



10. Zamenis Raver gieri, M^n. 



11. Ccelopeltis lacertina, Wagl. 

 12. Vipera euphratica, Mart. 



Frogs. 



13. Rana escidenta, var. ridihunda, Pall. 



14. Hyla arhorea, var. Savignyi, Aud. 



XLVII. — On the Affinity of the North- American Lizard- 

 Fauna. Bj G. A. BOULENGER. 



A RECENT work on the geographical distribution of animals, 

 by Prof. Angelo Heilprin (Intern. Scientific Series, vol. Iviii. 

 1887), contains the following remark (p. 317) : — 



" M. Boulenger has recently attempted to show (Ann. & 

 Mag. Nat. Hist. August 1885) that the North- and South- 

 American Lacertilian faunas are, strictly speaking, one, the 

 Neogean, a conclusion which is not borne out by the facts of 

 distribution. The misconception arises from the incorporation 

 of the tract lying south of the line indicated above [a line 

 drawn from San Francisco to Galveston, in Texas] with the 

 North-American faunal region proper, while in reality it is a 

 transition-tract more nearly Neotropical in character than 

 Nearctic." 



