BY R. J. TILLYARD. 



129 



as may be seen by studying the anal venation of the five genera 

 here figured. The Trichoptera, on the other hand, are constant 

 in this character, throughout an immense series of known forms. 

 Thus we can only conclude that, on this character, the Micro- 

 pterygidre agree more closely with the Lepidoptera than with the 

 Trichoptera. As regards the other venational specialisations of 

 the forewing, they are all shared equally in common with the 

 Hepialidw and with the Trichoptera, and there is no reason why 

 anyone should prefer to remove them to the Trichoptera rather 

 than to the Hepiatidce. 



Text-fig. 13. 

 Tracheation of forewing in pupa only two or three days old of Charagia 



• ri in in Scott, drawn in situ after removal of the upper wing-sheath. 

 Note the splitting back of trachea R, and the two separate origins of 

 Rs; ( x 11). For lettering, see p. 13b\ 



As regards the hind wing, there is the additional specialisation 

 of the partial fusion of vein 1A with Cu 2 . In Text-fig. 14, I 

 show the condition of the tracheation of the pupal hindwing, 

 near the base, in the genus Leto (Ifepialidce), together with the 

 corresponding imaginal venation. It will be seen that there is 

 exactly the same condition, except only that the two tracheae 

 Cu 2 and 1A do not lie so closely alongside one another. But 

 the pupa studied was only a few days old, and the fusion may 

 well become much closer towards the end of pupal life. It is 



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