Smithsonian Report. 1951. — Leutscher 



^LATE 1 



1. The Aesculaplan snake, named after Aesculapius, the Greek, god of healing. A tree- 

 climbing constrictor, it is at rest along a branch. This specimen is 3 feet long, but the 

 species can attain a length of 6 feet. The keels at the edges of the ventral shields arc 

 clearly shown. (Photograph by Lionel Day, F. R. P. S.) 



1" *■ .^ 



2. Northern viper or adder in a defensive attitude preparatory to striking at an object 

 waved above its head. (Photograph by Lionel Day, F. R. P. S.) 



