BLACK-VEINED. 79 



The following localities, among others, have beep 

 recorded as producing it : Herne Bay, and other part* 

 of the Isle of Thanet, plentifully ; near Favershain, 

 Kent ; Horsham, Sussex ; New Forest ; Brington, in 

 Huntingdonshire ; near Cardiff, South Wales, plentiful. 



The caterpillars are gregarious, feeding under cover 

 of a silken weh. The hawthorn and the sloe are its 

 chief food plants in this country, but it is here too rare 

 an insect to do much damage. ISTot so, however, on the 

 Continent, where it is extremely common, and is classed 

 among noxious insects, committing great devastation 

 /imong various fruit trees, especially the apple, pear, 

 and cherry. 



But even in this country the insect is occasionally 

 met with in great profusion, but only in isolated spots. 

 Mr. Drane, writing from Cardiff to the Zoologisi, says, 

 "In the middle of April (1858) I found the larvce feed- 

 : Tig by thousands upon insulated shir.bs of Prunus 

 o'pinosa (Common Sloe), eating out the centres of the 

 unexpanded buds, or basking in the sun upon thoii 

 winter webs." 



The body of the adult caterpillar is thickly clothed 

 with whitish hairs, is leaden grey on the side and uii- 

 derrieath, black on the back, and marked with two 

 longitudinal reddish stripes. Found from the middle 

 ot April to the end of May. 



The chrysalis, shown at fig. 14, Plate I., is greenish 

 white, striped with yellow and spotted with black. 



The butterfly appears in Juna, 



