THE ANNALS OF APPLIED BIOLOGY, VOL VII, NOS. 2 AND 3 



PLATE XX 



On the left: Saperda carcharias Linn., male (ash-grey variety) at rest on a twig of 

 Populus tremula Linn. 



On the right: Saperda carcharias Linn., female at rest on a leaf of Populus tremula 

 Linn. 



The figures illustrate how the colouration of the beetles is to some extent effective as a 

 means of concealing them. 



