1915.] NATURAL SCIENCES OF PHILADELPHIA. 33 



It is noteworthy that the sooty specimen Hke N. c. ohscura in 



134 



color has a very high scale count, it being 21 -, but since several 



other counts are nearly as large no significance can be placed on this. 

 As only two of the fifteen specimens are females, and since these 

 have average body scale counts, no sex differentiation is sho\vn. 



In the relative length of the body and tail the adult specimens 

 vary greatly from the described forms. For example, the one 

 specimen which follows so closely the description of the color of 

 N. c. compsolcema, and which also came from Key West, has for its 

 body-tail proportions 27.1%; Cope, on the other hand, gives meas- 

 urements of 21.5%. The Tampa Bay specimens check up lower in 

 average than the Key West ones. The range for the former being 

 22.6%-25.4%, average 24.1%, while the latter is 24.8-28.2%, average 

 26.1%. Since there is an overlapping of the high numbers of the 

 former and the low ones of the latter and since the range of the 

 whole series is not very great, races cannot be separated. 



In the same way, the head scutation of the adults show great 

 variation. For example, two of the male specimens from Key West 

 {A and B) have a color pattern very similar to iV. c. walkeri, their 

 dorsal rows are both twenty-one, yet they differ considerably as 

 shown below. Another specimen (C) from St. Petersburg is very 

 similar to N. c. compressicauda in color pattern, it has twenty-three 

 dorsal rows, yet its head characters are like those of (B) . 



Key West. St. Petersburg. 

 A - B C 



9+10 8+8 8+8 



^^°^^^^ 10+10 9+10 10+10 



2+2 2+2 2+2 



^^^^^^^ 1-1-1 1+2 1 + 1 



, 1+4 1+3 1+3 



Temporals y^ j^ ^^ 



Moreover, as a whole this variability is very great, the ranges for 

 individuals of the respective localities being: 



Tampa Bay. Key West. 



8+8 9+9 8+8 9+9 



Labials. 

 Oculars 



10+10 11 + 11 10+10 11 + 11 



2+2 _ 3+3 1+2 _ 3+2 



1 + 1 2+1 1 + 1 3+3 



1+3 2+3 1+2 1+4 



^^^P0Ta:\s ^j^ - 2q:3 1+2 " 1+3 



.3 



