132 HAWTHORN BUTTERFLY. 



tia, which it is further separated from hy the equal 

 length of the second and third joints of the palpi, 

 and the shortness of the former joint compared with 

 the basal one. The strong nervure that surrounds 

 each wing has never before been noticed." * 



The English name sufficiently describes this spe 

 cies, and readily distinguishes it from all its asso- 

 ciates. It is about the size of the Common Cabbage 

 Butterfly, the wings somewhat transparent, and of 

 a uniform white colour, with the nervures black. 

 There is also a black line round the outer edge of 

 the wings, and generally a few dusky triangular 

 marks on the outer margin of the upper pair. The 

 caterpillars are black for some time after they are 

 hatched, but soon become partially clothed with 

 hairs, and striped with reddish-brown on each side 

 of the body. (Fig. 3, PI. III. represents a full- 

 grown caterpillar of this species.) They are grega- 

 rious, and live for a time under a net- work of silk, 

 which they spin for their protection. Their favou- 

 rite food is the leaves of the Hawthorn, but they like- 

 wise attack fruit-trees, and have been known to 

 commit considerable damage in orchards. This but- 

 terfly is by no means generally distributed through 

 England, and is wholly unknown in Scotland ; but 

 it has occurred plentifully in the following places, 

 and is occasionally observed elsewhere: New Fo- 

 rest. Hampshire, Chelsea, Coombewood, Enborne, 

 Berkshire, Dorsetshire. It is by no means a scarce 

 * Curtis, British Ent. viil 360. 



