10 



ARKIV FÖR ZOOLOGI. BAND 8. N:0 9. 



We have already called attention to the tendency, amongst 

 the tissue-feeders, of the two dorsal apodemata to become 

 parallell. In some of the sap-feeders we find that they have 

 taken yet another step in this direction, so that they are 

 diverging backwards (fig. 5), vvhere they send out a branch, 



supporting the posterior dorsal angles of 

 the capsule, which are concealed in the 

 prothorax, and ona level with the postero- 

 lateral angles of the head connected by 

 a narrow bar. 



Not unfrequently the lateral edges 

 of the capsule are somewhat thickened, 

 and in Phyllocnistis there are some ac- 

 cessory bars, which strengthen the cap- 

 sule. These are delineated in fig. 6. We 

 notice that from the middle of the poster- 

 ior longitudinal bars a small lateral bar 

 branches off, which is connected with an 

 oblique bar running along the external 

 side of the posterior angle of the capsule, 

 and extending a little beyond the func- 

 tion of the bars. 



Gracilaria (Fig. 7) is not so far advan- 

 ced in this direction, the apodemata being 

 almost parallell, or öven slightly converg- 

 Fig. 7. Larva of Grad- ing backwards, where they are connected 



laria syringella, 2nd in- by a narrow> transverse bar. 

 står, dorsal aspect. X o0. J 



7. 



4. Arrangement and moclification of the ocelli. 



In a typical lepidopterous larva, the ocelli are placed far 

 forward on the side of the head, closely behind the base of 

 the mandibles; they are generally 6 in number, of fairly 

 uniform size and arranged in a more or less regular semi- 

 circle which is open posteriorly or subventrally (fig. 8). 



In the leaf-miners, we find that the eyes have undergone 

 a great modification both as regards arrangement and number. 



In Laverna, we notice (fig. 9) that the 5 upper ocelli are 

 arranged more in a line than in Ornix; and the same is the 

 case in Cemiostoma (fig. 10). 



