clxiv Pomeranian Species 



ella. At a fourth of the length of the wing from the base stands the 

 first striga, which is more curved than in L. Frolichiella, or even dis- 

 tinctly interrupted ; nearly on the middle of the wing follows a second 

 similarly formed striga. The first pair of opposite spots are two-thirds 

 of the length of the wing from the base, and not unfrequently run to- 

 gether at their apices, forming a third, bluntly angulated striga ; both 

 spots are internally distinctly margined with brown ; the following 

 smaller pair of opposite spots, as well as the odd costal spot, are 

 often faint. 



All the markings are more distinct and decided than in L. Froli- 

 chiella, the black scales at the apex of the wing are not generally so 

 scattered as in that species, but are more collected into an elliptic or 

 streak-shaped spot; beyond them a rather sharp, brown line runs 

 through the cilia, which are yellowish, darker at the anal angle. 



The under side is blackish, with the markings showing through, 

 and reddish cilia. Posterior wings as in Frolichiella. 



This species is not quite so abundant near Stettin as Frolichiella ; 

 however, in the autumn of 1848, 1 obtained so great a number of pu- 

 pae, that I was unable to set out all the moths that they produced. It 

 mines in the leaves of the hazel, and is frequently a companion of L. 

 coryli ; in collecting them, one can easily distinguish the habitations 

 of the two species. 



L. tristigella mines beneath the pulp of the leaf, and its abode is 

 very similar to that of L. Frolichiella on Alnus incana, but less so to 

 that on A. glutinosa. The period of flight is the end of May ; 1 have 

 not yet met with a second brood. 



The larva and its abode. — After carefully separating the mining 

 larvae of L. tristigella and my L. coryli, I have described the former 

 as follows. The abode in the hazel-leaf is always bordered on both 

 sides by two ribs of the leaf, and is generally very long and narrow ; 

 in the middle of the epidermis are some folds. The larva collects its 

 excrement in a corner of its abode. The first segment of the larva is 

 somewhat expanded, and has a black, twice-interrupted, transverse 

 streak ; the ground colour is dirty green ; head small, dark, heart- 

 shaped ; thorax divided lengthwise, once on each side ; legs distinct, 

 the two first, one sees project right and left from the head; first three 

 pair of prolegs quite distinct ; anal pair imperceptible. The larva is 

 lively. The cocoon of the pupa, which generally is not narrower than 

 the entire abode, lies almost between the skins, and is rather firmly 

 fastened to them, it is yellowish, and of the consistence of paper ; the 

 pupa itself is shining pale brown. 



