BY R. J. TILLYARD. 



425 



i K. mmmmm 



Text-fig. 1. 

 Structure of the costal space and radial sectors in the forewings of various 

 Ithonida (all x 6). a, Ithone fueca Newm., 6 , to show the dichoto- 

 mic branching of the single Rs. b, the same, with Rs pectinately 

 branched, c-d, Heterithone fidva (Till.), 6 paratype, left and right 

 forewings. e, H. fidva (Till. ), 6 holotype, right forewing. f-y, H. 

 meyactrca, n.sp., & holotype, right and left forewings. h, II. meya- 

 ctrca, n.sp., S paratype, right forewing. j-k, II. pallida, n.sp., 6 

 holotype, left and right forewings. l-m, H. pallida, n.sp., ¥ allo- 

 type, right and left forewings. (Compart Text-tig. 4c). 



