BY R. J. TILLTARD. 



215 



does not cbitinise in the imago; and hence the cell of the forewing is a true aneocel 

 of the Tortricid type. 



Thus this portion of the forewing indicates some affinity with the Tortricina, 

 as does also the form of the egg. 



The contrast between the form of the radial sector of the forewing in Morova 

 and in the Butterflies can be noted at once by comparing Text-fig. 113 with 

 Text-figs. 99 and 101 of Part 3 of this work already referred to. I think that this 

 character alone should put out of court any suggestion that the Thyrididae can 

 possibly be ancestral to the Butterflies. It is only in the Cossidae, the oldest ex- 



Ri R, 



Text-fig. 113. 

 Morova (Siculodes) sub/asciata (Walk.), (fam. Thyrididae). a, tracheation of pupal wings 

 (x 18). b, the contlition of the racUal trachea and its sector in the forewing, further 

 enlarged (x 45) . 



isting family of Heteroneura, that we find conditions at all approximating to 

 those of the Butterflies with respect to the separation of Rs into two stems arising 

 well apart from Ri, This should incline us to look for the origin of the Butter- 

 flies much further back, almost certainly in some group that has long ago become 

 extinct, and has left no very close relatives existing to-day. 



