682 



THE PANORPOJD COMPLEX, 111-, 



Text-Fig. 100. 

 Euschemon rafflesia Macleay, (fam. Hesperiidae) ^jimaginal^venation 



(x 2^). Lettering as on p. 535. 



in the usual position, as shown in Text-fig. 99, b. Later on, a 

 huge mass of vein-chitin is laid clown over the bases of the 

 main veins, and M 5 becomes completely enclosed within it. 

 Trachea M 5 does not appear until near metamorphosis. 



(6) The cross-vein cu-a is laid down as a pale band in the 

 forewing only, in the early pupa, as shown in Text-fig. 99. b. 

 It suffers the same fate as M 5 , being swallowed up in the mass 

 of vein-chitin which forms around it later on. 



(7) Trachea? M and Cu 2 remain complete throughout pupal 

 life. But no chitinisation takes place either along Cu 2 or along 

 any part of M lying within the basal cell. 



(8) In the forewing, no chitinisation takes place along R 4+5 , 

 from its origin on R to the point where it forks. This is an 

 important point to bear in mind when studying the method of 

 formation of the basal cell at metamorphosis. 



