254 THE INSECT WOELT). 



One part of Fig. 233 shows the arrangement of the caterpillars 

 on coming out of the nest, and in another part is shown a 

 different arrangement, in which each row has only one caterpillar 

 less than the one which preceded it. These caterpillars are fur- 

 nished with long hairs, slightly tufted, which come off with the 



Fig. 2'M. Larva; of the Procession Moth {Boitdiyx processioned). 



greatest ease, and which, if they penetrate into the skin, cause 

 violent itching. In 1865, a number of the alleys of the Bois de 

 Boulogne were shut up from the public, in order to save them 

 from this annoyance. These caterpillars construct a covering* 

 common to them all, in which they live, and transform them- 

 selves therein, each insect making for his own private use a small 

 cocoon. This insect is said to have occurred in England, but there 

 is not sufficient evidence to admit it into our lists. 



The Orgyias comprise a great number of small species, of a 

 dark colour, which do a great deal of damage to our forest trees. 

 In September and October the male of the Orgyia antiqua, with 

 his tawny wings, may often be seen flying about the streets of 



