I. TRAGARDH, LEPIDOPTEROUS LEAF-MINERS. 



35 



pores, and we recognize also the usual two plates, embracing 

 the base of the palpi, and which I interpret as modified basal 

 joints of the palpi (fig. 54). 



In a young lar va of C. laburnella t lie spinneret and the 

 palpi are not quite so reduced as in C. scitella, and the former 

 is still discernible as a very small, hyalin appendage, bifurcate 

 at the top, while of the palpi exceedingly small remnants 

 remain, bearing a hair at the top. The older larvse, on the 

 other hand, do not differ essentially from those of C. scitella. 



There remains one feature of the mouth-parts of these 

 two larvae which must be pointed out, viz. the remarkable 



Nepticula spp. 



Fig. 55 a. Labium, ventral aspect. X 363. 



Fig. 55 b. Labium and maxilla, ventral aspect. X 417. 



increase in the size of the stipes of the maxillse. These project 

 forward to a level with the top of the mandibles when half 

 closed, and their anterior margin - projects as a free, horizontal 

 blade beyond the artieulation with the palpiger, while the 

 external margin projects also as a free blade beyond the 

 lateral endoskeletal ridge (fig. 53). 



In the subsequent course of the investigation we shall 

 see the probable use of this structure, and how in the genus 

 Liihocolletis it is developed to a far highe degree. 



