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TRICHOPTERA. 



Notes ON British Trichoptera, with Description of 

 A NEW Species of Rhyacophila. 



By R. M^Lachlan, F.L.S. 



Having been again requested to furnish any new information 

 I may possess on insects of this order, I have much pleasure 

 in complying; and in the notes which follow have endeavoured 

 to chronicle v\4iat has been done during the past season, and 

 I must premise that it is not my fault that this is so little. 

 I had hoped that by this time, Dr. Hagen's labours to 

 unravel the tano;led web in which the knowledg-e of the 

 British and Continental species generally had become involved, 

 would have been better appreciated, and that now, instead of 

 half-a-dozen workers (and this is the maximum), there would 

 have been admirers of the group spread over the length and 

 breadth of the land. It may be very pleasant to have a 

 branch of study almost to one's self, but it would be far 

 more satisfactory to know that others were following the 

 same pursuit, and that there was some chance of obtaining 

 something like an accurate knowledtj-e of our wealth of 

 species and of their habits and transformations. When one 

 looks at the number of workers in other orders, for instance 

 Lepidoptera and Coleoptera, and sees that notwithstanding 

 the vigilance with which every part of the country is ran- 

 sacked, yet there usuallv appears a long annual list of 

 1863. ' K 



