154 TRANSFORMATIONS OF INSECTS. 
the light. It does not quit the leaf which nourishes it, but 
when about to undergo the change into the chrysalis state a 
thick silken cocoon is spun, which is usually of a dark green 
colour, and the metamorphosis proceeds. 
The tiny caterpillars of this mining insect with such a very 
long name may be seen in different positions on the leaves of 
Orneodes hexadactylus. Pterophorus pentadactylus. 
(Natural size, and magnified.) 
the plant engraved on page 153. The cuticle has been broken 
so as to show the larve and in one leaf the pupa. 
Two genera—Pverophorus and Orneodes—of the great tribe 
of the Zzzeina require to be noticed on account of the singular 
conformation of their wings. The organs of flight appear to 
have suffered a singular amount of degradation, so far as 
their development is concerned, in these little insects, but they 
are nevertheless exquisitely delicate and peculiar, for the wings 
are divided longitudinally into several branches, and each of 
these is furnished with a long fringe of wonderful silkiness, so 
that the appearance is presented of pretty little plumes of 
