I. TRÄGARDH, LEPIDOPTEROUS LEAF-MINERS. 17 



nally; at the top of the same joint we find the two papilla? 

 and two small hairs recorded from Gracilaria, while the 

 terminal joint has a small hair and a papilla at the top. 



In Ornix (fig. 22), we find a slender antenna with slightly 

 constricted basal joint, 2 papilla? and 3 hairs, one of which 

 is much longer; one of the papilla? is comparatively verv 

 large, being longer than the 3rd joint, which is narrow and 

 conical, and has one terminal papilla and one small hair. 



The same slender type we find in the young Lithocolletis 

 (fig. 26) where also the 2nd joint has two papilla?, which are 

 finger-shaped, one of them being comparatively large; of the 

 hairs, on the contrary, only a short one remains: the 3rd 

 joint is bifurcate at the top, as in Gracilaria, and the larger 

 one of the fingers has a terminal bristle which bends up- 

 wards. 



It is first in the lar va? of Phyllocnistis (fig. 23) that we 

 meet a reduction in the number of joints, the 3rd or terminal 

 joint being almost atrophied, the probable remnant being a 

 small papilla situated between the two sensorial papilla?; 

 on the 2nd joint I ha ve only been able to find one very 

 small hair. 



In the young Gracilaria (fig. 24), and in the larva? of Cemi- 

 ostoma the number of artides is also reduced, but the basal 

 joint is the one subjected to this modification. In Gracilaria 

 it is probably only present as a basal rim round the base 

 of the 2nd joint; the latter has a very characteristic shape, 

 being slightly club-shaped and bent inwards; it has the usual 

 two papilla? and two hairs, one very minute, the other long 

 and curved inwards at the top; the 3rd joint is short, and 

 has two short, stout terminal bristles and one papilla. 



In Cemiostoma (fig. 27) no basal joint is discernible ; the 

 2nd joint is still shorter than in Gracilaria, and bent inwards; 

 it has a long, curved hair; one small hair and two large sen- 

 sorial papilla?; the 3rd joint points obliquely outwards, and is 

 only half as wide as the 2nd one; it has a sensorial papilla 

 and 3 hairs, one of which is almost twice as long as the 

 papilla, Avhile the others are only half as long. 



Nepticula (fig. 25) has taken yet another step in the 

 reduction of joints, the antenna? being shaped like low cushions 

 on which there are two papilla? and 2 — 3 hairs, one of which 

 is very long. As we have invariably found the long hair 



Arkiv för zoologi. Band 8. N:o 9. 2 



