1890.] 



X27 



NOTES ON THE METAMOEPHOSES of BEITISH LEPTOCERIDM (No. 1). 

 BY KENNETH J. MOETOIS". 



In the following series of notes are given, in part, the results of 

 studies made during the past few years on the development of the 

 British species of Trichoptera. While I have not neglected the other 

 families, the Leptoceridce, on account of the beauty and graceful forms 

 of the perfect insects, have been my favourites, and I have had most 

 success in rearing from the larva within the limits of that family. In 

 addition to the materials amassed by myself, I owe to the kind com- 

 munications of Prof. Franz Klapalek of Prague, an acquaintance with 

 the preparatory states of several interesting forms which, although 

 found in this country, have not occurred to me personally. 



It is my intention in the meantime to give full descriptions (with 

 some figures) of the larva, nymph, and case of at least one species 

 out of each of the Sections adopted by Mr. McLachlan, an idea which 

 may afterwards be extended so as to include, as far as possible, repre- 

 sentatives of all the British genera. 



A few words with regard to the figures. It must be borne in 



mind that the appearance of the mouth parts varies greatly according 

 to the extent of exsertion, and the point of view from which they 

 are seen. It is usually difficult to get a good view of the labrum of 

 the larva in situ, on account of its often nearly vertical position (the 



