In referring to the dorsal rows, the exterior one, or that next the scutellse, 

 b considered to be the first, unless the contrary is stated. 



When there are two numbers separated by the symbol (+) at the beginning of 

 the measurements, the first indicates the number of entire abdominal scutellse; 

 tlie latter, of those that are bifid or divided. The subcaudal scutellse are to be 

 considered as divided or in pairs, unless mentioned to the contrary- 



In enumerating the number of labial plates, those on one side of the jaws 

 only are to be understood, and the terminal and median one on the symphysis 

 of the upper and lower maxillaries is never included. On the upper jaw, that 

 plate is at the end of the snout, and is the rostral. 



The descriptions are all based on specimens preserved in alcohol, unless 

 othenvise stated. 



