488 



PROCEEDINGS OF THE NATIONAL MUSK I'M 



136, 3; 137, 4; 138, 4; 139, 4; 140, 1; 142, 3; in males, 122, 1; 123, 1; 

 124, 2 ; 125, 1 ; 126, 4 ; 127, 8 ; 128, 7 ; 129, 4 ; 130, 3 ; 131, 2) ; this possibly 

 indicates that, with larger series, the more accurate measurement of 

 central scale number is secured by counting all ventral scales from 

 chin shields to anal, as both the obvious variation in the position of 



If ig. 14. — Variation in tail-total length proportion (abscissa) plotted against total length 

 (coordinate) in females of Toluca I. varians. 



100 120 140 160 160 £00 220 240 <xu tou juu mtv 



fig. 15. — Variation in tail-total length proportion (abscissa) plotted against total length 

 (coordinate) in males of Toluca I. varians. 



the first ventral, as well as the human variable introduced by the 

 necessity of arbitrarily deciding which ventral should be counted as 

 first, are eliminated ; larger series will be necessary, however, to dem- 

 onstrate whether this indication is true. 



Without exception the supralabials are 7-7. The infralabials are 

 normally 7-7, but in six specimens (three of each sex), there are 6-7 



