of the Genus Lithocolletis. clxvii 



larvae, and a summer brood from the larvae which feed in the spring 

 and summer. 



25. L. tremulae, Z. 9 is abundant at Eckerberg, Polchow, Falken- 

 wald, and also at Ueckermiinde. The mined abode of this species, in 

 the leaves of the aspen [Populus tremula) is partly pure white, partly 

 of a beautiful rose-colour, often also dirty brown on the epidermis ; the 

 latter colour may probably be accounted for by the advanced period 

 of the year. In 1849, I found a larva on the 8th of September. The 

 perfect insects appear still earlier than L. pastorella, from the end of 

 September hardly to the middle of October. The first brood appears 

 after the middle of July. 



26. L. populifoliella, Tr. I first found this on the 25th of August, 

 1849, in the larva state. It mines the leaves of Populus nigra and P. 

 pyramidalis everywhere. My specimens come from the trees in the 

 avenue near Eckerberg. The part of the leaf inhabited by the larva 

 lies between two (parallel) side ribs. The larva does not go beyond 

 these ribs ; from this and from the semicircular form of the other two 

 ends, the abode acquires its regular shape. The lower skin of the leaf 

 is pure greenish white and very transparent, only from becoming faded 

 with the advanced season of the year, becoming opaque and spotted. 

 In the middle of it, and parallel with the including side-ribs, are seve- 

 ral very fine, pale yellowish folds, which curve the abode only very 

 slightly. From the upper skin of the leaf, the pulp is not eaten away 

 regularly as it is by the oak-miners, but here and there, either in the 

 middle or at the sides. 



The larva is anteriorly very broad and flat ; the 1st and 3rd seg- 

 ments are of equal breadth, the 2nd is the broadest of all : from the 

 4th segment the body gradually diminishes. The head is flat, small, 

 quite pale, only brown at the ends of the jaws. Legs very far apart. 

 The first eight segments are pale greenish white, the others, excepting 

 the last, are egg-yellow, but paler than in L. tremulae : the anal seg- 

 ment is almost of the colour of the first segments ; the marginal line 

 between all the segments is green. The pupa reposes in a thin, easi- 

 ly-torn cocoon, and is quite black. 



This species appears as early as the beginning of September, when 

 one takes it at large on poplars. The period of flight of the spring 

 brood is unknown to me. 



With this species I conclude, for the present, the Catalogue of the 

 Pomeranian Lithocolletides. 



