158 



PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Homology of Epicranial Setae. 



designated them as the Posterodorsal group, and the 3 forward 

 setae and puncture as the Anterodorsal group. I also place the 

 most lateral of Dampf's Dorso-laterals (Dyar's III) and the 

 puncture (L-la) on the side of the head near it, in a group by them- 

 selves, calling them the lateral group. I think this is justified 

 by the "migration" of the group, whch is of great significance; 

 for the approximate distance of L-l from Ad-3, (as compared 

 with distances separating the different Anterodorsals) in heads 

 superficially alike (tortricid, gelechiid. or oecophorid), not only 

 aids in the separation of such groups, but indicates a different 

 scheme of head development in this particular region. In study- 

 ing the heads of the Cossidae it was also found that there is a dis- 

 tinct chitinization marking the areas of Anterodorsal, Ocellar 

 and Subocellar groups. That the Lateral seta and puncture fall 



