154 



TRANSFORMATIOXS OF INSECTS. 



the light. It docs 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 



Orncodes hexadactyhis, Pferoplioj-iis pcntadactylus, 

 (Natural size, and magnified.) 



the plant engraved on page 153. The cuticle has been broken 

 so as to show the larvae and in one leaf the pupa. 



Two genera — Ptcrophoriis and Ojiicodcs — of the great tribe 

 of the Tincijia 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 



