414 DESCRIPTIONS OF AUSTRALIAN MICRO-LEPIDOPTERA, 



consideration of the sum of the characters, rather than a blind 

 dependence on one alone. In the present paper the Tortricida 

 alone are included ; the Grapholithida and Conchy lida, which even 

 together are much less numerous, will form the subject of the 

 next instalment. 



The Tortricida are divisible by means of the neuration into 

 well-defined and natural groups which might, if desirable, be 

 adopted as subfamilies, viz. : 



a. Mictoneura Veins 8 and 9 of forewings rising on a stalk from 



7 (genus 1). 



b. Acropolitis group Veins 3 and 4 of hindwings separate at 



origin (genera 2-10). 



c. Dickelia group Veins 3 and 4 of hindwings from a point or 



stalked, 7 and 8 of forewings stalked (genera 11-16). 



d. Tortrix group Veins 3 and 4 of hindwings from a point, 7 



and 8 of forewings separate (genera 17-21). 



There are also other lower-organised groups, but they are 

 apparently not represented in Australia, and I will not therefore 

 attempt to define them. Assuming that the origin of the family 

 is to be found in the extreme forms of the Gelechidce (Dasystoma 

 and CMmalacclteJ, a direct progression may be traced from such 

 forms as Cheimatophila and Exapate through SciapMla to Tortrix 

 and Caccecia. with a continually increasing breadth of wing ; the 

 transition from these to Dickelia seems at present to be incomplete, 

 there being no distinct indication of the steps through which 

 veins 7 and 8 of the forewings became stalked ; Capua is a modi- 

 fication of Dichelia, and from Capua are formed Acropolitis and 

 Py ryot is by the separation of veins 3 and 4 of the hindwings ; 

 and from these latter again are developed the more extreme forms 

 of this type, with veins 3, 4, 5 all equidistant and parallel, and 

 the other details of structure often considerably modified. 

 3ictomura stands at present so remote from its allies, that it is 



