Li be II u la. 1 1 5 



observation of Mr. Arkle, in Delamerc Forest, who, in 

 the Entomologist, p. 35, 1898, says: "There the\- 

 were at var\-in;^" intervals, with their wings spread out 

 and ghstening, for all the world like distant windows in 

 the setting sun. Far awa\' for a long distance on the 

 heath I could easilx' make them out." 



Migration. 



As a wanderer this Dragonfl}' is well known, and to 

 this habit is due perhaps the fact that it circles the 

 globe in the cooler zones of the Northern Hemisphere. 

 Man}- hAU'opean migrations ha\e been recorded. 



A tremendous swarm passed over IMalmi"), in Sweden, 

 in June, 1883;^ a large one was observed off the 

 Essex coast in June, 1888 ; t while a smaller one 

 visited Doxer in June, 1889. J The account of the 

 first-mentioned flight, as recorded in A\rt//n\ is here 

 reproduced: "On Sunda}-, June 24, we had an 

 extraordinary flight of the Trollslauda {Libdlnla 



quadriinaculata, Linn., a brown Uragonfl)-, i^in. 



long and 3in. from tip to tip of the wings. Thc}- passed 

 o\'er or through the town and neighbourhood for about 

 half an hour in the afternoon. The next da}', about one 

 o'clock, the}' reappeared for more than an hour ; but on 

 Tuesda}', the 26th, at 7.30 a.m., the}^ again began in 

 millions, and notwithstanding the wind had shifted to 

 the South during the night, they held the same course 

 from North-West by West, heading South-East bv' East. 

 The streets, shipping, and e\-er}' place were full of 



••* X<itiirc, July 19th, 18S3. Vol. xxviii., p. 271. f J- Cordeaux. E. ^l. M., 

 1888, p. 93. + C. G. Hall in E. M. M., 1889, p. 324. 



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