336 
These examples point up that many of the 
ways of handling information common to 
other vertebrate groups also occur among 
the lizards and that the problem of under- 
standing communication between lizards is 
open to new approaches. 
MacLEAN and GREENBERG: With the 
thought of new approaches in mind, we would 
like to say how disappointed we are that 
Llewellyn Evans was unable to participate in 
the symposium and we would like to draw 
attention particularly to his fine study on the 
black lizard (1951. Am. Mus. Nov. No. 1493. 
pp 1-26). 
