62 ILLINOIS BIOLOGICAL MONOGRAPHS [62 



Psychidae 

 Elachistidae 

 Coleophoridae 

 Gelechioidea 



Ethmiidae 



Stenomidae 



Hemerophilidae 



Gelechiidae 



Oecophoridae 



Blastobasidae 



Cosmopterygidae 



b. Pyrali-zygaenoid series 

 Pyralidoidea 



Pyralididae 



Orneodidae 



Pterophoridae 

 Zygaenoidea 



Chalcosidae 



Pyromorphidae 



Epipyropidae 



Dalceridae 



Megalopygidae 



Cochlidiidae 



Position uncertain 



Lacosomidae 

 Nolidae 

 | 



Aculeata. The four small families included here are so reduced in 

 size and structure that a classification of them based on larvae would 

 require special preparation and a special set of characters. It is prob- 

 able that the tentorium will be found to yield important evidence on the 

 relationships of the families to each other and to other leaf-miners, such 

 as the Gracilariidae. In all the species the crochets are wanting or in 

 rudimentary transverse bands. The arrangement of the setae seems 

 in most cases to be indistinguishable. The group Aculeata is based, as 

 yet, wholly on adult structure. While both adults and larvae are special- 

 ized by reduction, the presence of aculei, on which the group is based, 

 is a generalized character. The larval structure of the various species 

 is described on a later page. 



Non-aculeata. This general term comprises all micros without acu- 

 lei on the wings. On the basis of larval structure scarcely a single 

 character unites them to each other. The most constant distinctions are 



