12 



ARKIV FÖR ZOOLOGI. BAND 8. N:0 9. 



is large and placed ven t rally behind the depressed area, 

 where the antenna is inserted. 



In Tischeria we observed that the ocelli showed a ten- 

 dency to separate into two groups of 3 each, one anterior, 

 one posterior. 



Lyonetia has taken yet another step in this direction and 

 indeed the arrangement of its ocelli is a very remarkable one, 

 they being separated into two groups, widely apart (fig. 18). 



Fig. 13. 



Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 18. 



14. 

 15. 

 16. 

 17. 



Part of head capsule of Eriocrania sp., ventral aspect, with 



the ocellus X 465. 



Same of Nepticula. X 465. 



» » young LilJiocolletis sp. X 465. 



» » » » sp. X 206. 



» » grown » ventral aspect, X 465. 



» » Lyonetia, dorsal aspect. X 465. 



One, consisting of 3 ocelli, placed marginally and submarginally 

 close together behind the antennal area, whereas the other, 

 also consisting of 3 submarginal and marginal ocelli, is placed 

 far backwards in the posterior third of the capsule immediately 

 behind its greatest width. In Nepticula (fig. 14), as in Erio- 

 crania, there is only one ocellus left, which is large, with con- 

 spicuously convex lens. It is, however, not placed ventrally 



