of the Genus Lithocolletis. cliii 



This species mines in the leaves of the hazel (Corylus Avellana), 

 not rarely in all leafy woods near Stettin. It loosens the thin upper 

 skin of the leaf to a considerable extent, then draws the loosened part 

 together in many narrow folds, by which the abode of the larva as- 

 sumes an almost cylindrical form, at least like the leaf itself, a very 

 irregular appearance. The cocoon is light and fine ; the pupa itself 

 pale brown. I do not know the period of flight, since I never met 

 with it in the open air. 



Note 1. — I first found L. coryli as pupae on the 8th of October, 

 1848, near Eckerberg, in the meadow. In the warm room I obtained 

 specimens from the end of December, through January and February, 

 to the beginning of March. From this I conclude that it has a very 

 extended period of flight. It occurs most abundantly at Polchow and 

 Eckerberg, but also at Vogelsang and Falkenwald. 



Note 2. — Details of the mined abode and larva. The abode of the 

 larva is of so peculiar a form that one thereby very easily recognizes 

 the presence of the Lithocolletis. When the young larva, after its 

 exclusion from the egg, has bored into the leaf from above, it begins 

 by loosening the very fine upper skin of the leaf to a great extent ; 

 during this process it appears only to feed on the fibres which fasten 

 the skin to the flesh of the leaf, and which it is obliged to loosen. It 

 afterwards curves the mined abode by many folds in the upper skin of 

 the leaf, which at the time of its transformation it draws closer and 

 closer together. If it begins with the curving its abode, it then pro- 

 ceeds afterwards to the consumption of the pulp of the leaf at the 

 loosened place. 



The abode is generally so situated that a side rib of the leaf bisects 

 it ; when the larva draws the folds together, it always places them 

 closer and closer to this rib, so that the leaf finally, as seen from above, 

 has only a longish elliptic spot pointed on both sides, the two points 

 of which are on the rib of the leaf. The larva collects its excrement 

 into little heaps in a corner. 



The larva itself is of the size of the larva of L. ulmifoliella (2 — 3 

 lines long) ; head and feet as usual, ground colour pure yellow, the 

 first segment has only a slight deposit of darker atoms, the second 

 very broad segment is darker yellow. In most of the segments the 

 anterior margins are black, the black incision-lines are wanting be- 

 tween the second and third, the seventh and eighth, the eighth and 

 ninth, and the eleventh and twelfth segments. After the third ring, as 

 is usual in the larvae of Lithocolletis, the eaten pulp of the leaf ap- 

 pears as a green originally brownish streak. The pupa is small, and 



