42 BRITISH INSECTS 



" demoiselle," l which is common in the South, may 

 be cited as an example. The male is bright metallic 

 blue in colour, with red eyes, and a large patch of 

 opaque blue in the centre of each wing. The female 

 is metallic green, with yellowish, transparent wings. 



In all, there are about forty species of British 

 dragon-flies, but several of these are very rare. 



1 Calopteryx splendens . 



