THE GREAT WHITE BUTTERFLY. 163 



Daniel Bydder was once one of the most indus- 

 trious of these collectors, as Mr. Westwood informs 

 us, and was employed by Dr. Leach, at that time 

 one of the principal curators in the British Museum, 

 to collect for him in the New Forest, where he was 

 so fortunate as to discover and capture for the first 

 time in England the rare insects Platypus Cylindrus 

 and Cicada Anglica. He was also the first among 

 the weavers to attempt a scientific arrangement 

 of his collection, but many afterwards followed his 

 example ; and they have now a scientific society of 

 their own as " Practical Entomologists," with a 

 well-arranged collection, and general meetings on 

 fixed evenings, like those of the more ambitious 

 associations of the richer classes. 



The Caterpillar of the JPolyommatus Adonis, or 

 Clifden Blue, as it is popularly called, is not well 

 known, but is certainly of the kind termed onisci- 

 form, or Wood Louse-shaped, like those of the whole 

 Argus family. It has been described by Eabricius 

 as being green, with rows of fulvous spots along 

 the back. 



The Caterpillar of an allied species, JPolyommatus 

 Cory don, engraved in this Plate (PI. III. No. 4), will 

 give a good idea of its general appearance. JPoly- 

 ommatus Corydon, figured just below in the same 



