254 THE INSECT WORLD. 
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 
ye 
‘ 
\ 
SSO 
NSS 
\ \ Ni 
CY 
~ c. \ 
Hebe 




Fig. 233.—Larve of the Procession Moth (Bombyx processionea). 
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 
