Mexican Amphibians and Reptiles. 693 
0 10 20 0 m 50 60 70 Species 
Diagram No. I. 
Showing the number of species occurring at the various altitudes. 
Black, unbroken line — Total number of species. 
Black, dotted line == Nearctic species. 
Black, erossed line == Sonoran species. 
White-circled line — Southeın species. 
those the reputed localities of which I have sufficient reasons to 
consider erroneous. Thus it has come to pass that the total available 
material of perhaps 350 species had to be sadly reduced. By thus 
Zool. Jahrb. XXIX. Abt. f. Syst. 45 
