I. TRÄGÅRDH, LEPIDOPTEROUS LEAF-MINERS. 



31 



In the mouth-parts of this larva we meet some interesting 

 features, above all in the labium; while in most of the lepi- 

 dopterous larvae the labial palpi are 2-jointed, in Eriocrania 

 (fig. 48) they are 3-jointed, a feature which is undoubtedly a 

 primitive one; in the main part of the larvae this basal joint is 

 coalesced with the mentum, but still discernible as a distinct 

 plate, separated from the rest by narrow streaks of soft cuticle. 



*/. 



4Z 



Eriocrania sp. 



Fig. 46. Maxilla, dorsal aspect. X 413. 



Fig. 47. Hypopharynx, dorsal aspect. X 413. 



Fig. 48. Labium, ventral aspect. X 413. 



The only species, where a free basal joint has been found 

 is Adela degeerella (L.), in which Dampf (14. p. 585) has pointed 

 out its existence; 1 in that species it is, however, not so free 

 as in Eriocrania (comp. Fig. Y, sid. 583); the relative length 

 of the other two joints corresponds to that of the two joints 

 still present in other larvae. The spinneret is comparatively 

 short and broad, and is not placed at the anterior margin 



1 D. however, does not call it a joint, but »Basalring des 2. Labial- 

 tastergliedes». 



