494 DESCRIPTION OF THE MUSEUM. 



it is blue in that of the ash-tree (n os 25 and 26). 

 The pyralis fagana (n° 4) is one of the prettiest 

 species of this genus : the caterpillar of the po- 

 rno? 1a (n° 11) feeds on the seeds of apples and 

 pears : the cocoons of several species of pyralis 

 are in the form of a boat. The caterpillar of the 

 cossus ligniperda (n° 6) and that of the horse- 

 chesnut (cesculi, n° 7) live in the interior of 

 different trees and often destroy them. The he- 

 pialas hamuli (n° 8) attacks the roots of the hop- 

 plant. 



The name of tinece is given to those lepido- 

 ptera which destroy fur and woollen cloths. The 

 industry of the caterpillars is very singular; of 

 the remains of the hairs they feed upon, they 

 make a tubular case to reside in, and lengthen or 

 enlarge it by the addition of new materials, as 

 they grow. The insects which are here united to 

 the tineae or cloth-moths, and which are distin- 

 guished by their white wings spotted with black, 

 form at present the genus yponomeuta, Latr. ; 

 their caterpillars, which are very small, live gre- 

 garious under a silken tent, and they often en- 

 tirely strip of their leaves the trees on which 

 they establish themselves. IN 2 is the tinea evo- 

 uymella, Fabr. The last frame of the lepidop- 

 tera contains those species whose wings, from 

 their division and their down, resemble the plu- 



