34 [February, 



ODONATA. 

 Libellula depressa, L. — 1 ? , middle of June ; of large size. 

 Gomphus simillimus, Seljs— 1 $ , middle of June. 



Synipycna fusca, V. d. Lind. — 1 <J , June 19th. This was but little known as 

 a Spanish insect. [Dr. Chapman brought numerous examples of it from Cuenca.] 



Lewisham, London : 



December 22nd, 1901. 



TRICHOPTERA, PLANIPENNIA AND PSEUDO-NEUROPTERA 

 COLLECTED IN NORTH WALES IN JULY. 1901. 



BY KENNETH J. MORTON, F.E.S. 



While the beautiful district of North Wales seems to possess 

 some resident Entomologists, and is no doubt visited by many tourist 

 Entomologists, I do not think it has ever been seriously investigated 

 by any one making the collection of insects of the above Orders his 

 primary quest. This was one of the reasons which led me to spend a 

 holiday in Merionethshire this year. 



Our headquarters were at Egryn, a place situated between 

 Barmouth and Harlech, and the chief collecting was done between 

 these points, the localities being the small bogs lying close to the sea, 

 the springs and streamlets running into and the ditches intersecting 

 the Morfa, the rapid waters and torrents running through the small 

 valleys— these valleys being wooded in their lower parts — and the 

 lakes which give rise to certain of these streams Wider excursions, 

 such as the ascent of 8nowdon and Cader ldris, although undertaken 

 with light entomological equipment, for several reasons, yielded 

 nothing in my way ; indeed, none of the higher points were produc- 

 tive. 



All the waters of the district are very clear — a feature no doubt 

 due to the geological conditions — and there is a uniformity of 

 character about them which seems to have a restricting influence on 

 the number of species they produce. At any rate, during the month's 

 stay, the species of Trichoptera taken reached a total rather under 

 the average to be looked for in a good British locality. At the same 

 time the conditions favour certain species which are not usually 

 common, Adicella reducta, McL., being an almost ubiquitous species 

 round Egryn, occurring at streams of different sizes ; Plectrooiemia 

 geniculata, McL., apparently entirely replacing its better known 

 congener conspersa, Curt. ; and Polycentropus Kingi, McL., in the 

 shaded parts of the stream it haunts, a commoner insect than the 

 usually never failing P. flavomaculatus, Pict. 



