668 



THE PANORPOID COMPLEX, 111. 



arise as part of the pale banding which foreshadows the 

 imaginal venation. 



The principal changes which take place during pupal life are 

 those which affect the discocellulars, at the distal end of the 

 basal cell. Text-fig. 91 shows the condition in a pupa ton 

 days old. A small trachea grows out from R 4+ 5 in forewing, 

 or Rs in hindwing, down towards M 1; while another grows out 

 from Cu la up towards M g . Just before metamorphosis, these 

 tracheae are still only quite small. But, during metamorphosis, 

 they capture the respective trachea? towards which they have 

 been growing; so that, in the freshly-emerged imaginal wing, 

 as soon as it is fully expanded, the condition is that shown in 

 Text-fig. 91, c, d. Thus Mj becomes completely hitched on to 



Text-Fig.91. 

 Details of the changes in the tracheation in the wings of Wingia lam- 

 be rtiella (Wing), (fam. Oecophoridae) in the region of the dis- 

 cocellulars; a, forewing, b, hindwing, of late pupal stage; c, fore- 

 wing, d, hindwing, of freshly emerged imago, (x 15). Lettering as 

 on p. 535. 



