Libel ill 1(1. I 17 



qnadripiiiictata swarmed there b\' the million and con- 

 tinued to the 26th, when the wind became northerl}-, 

 and next morning' not a single one was to be seen.* 

 . . . On June 6 in the same }'ear, Mr. Hall, of 

 Dover, re|)orted a flight of some hundreds of Dragon- 

 flies of this species ( possibi)' belonging to the flight 

 last mentioned ;, which took place at Do\-er. They were 

 fl\-ing round the middle of the Admiralt\' Pier, and were 

 not obserxed in the town. Mr. Hall states that he had 

 witnessed extraordinary flights of this species in I-^rance. 

 .similar to the swarms obser\'ed at Alalmo, in 18S3, but 

 that the one at Do\-er was small. The weather was 

 dull and oppressively hot, with a slight wind from the 

 N.h^, and the Dragonflies a|)peared to have come up 

 with the storm-clouds in a south-westerl\- direction. 

 Hundreds were seen the next da\-, notwithstanding a 

 storm on the evening of the 6th, and a few on the 8th. 

 Some were war. pi\cunbila, and in one the sub-costal 

 \'eins between the base and the cubital spot, were 

 slighth' tinged with orange. Such are instances of 

 migrations that ha\e been recorded in the English 

 magazines. It is reported that a great migration occurs 

 almost ex'er}- }'ear from north to south in the Charente 

 InttM'iciu'e in France. 



Distribution, 



Though considered a local insect, LibcUiila qiiadri- 

 iitaciilata is well distributed thrcjughout the British Isles, 

 and where it occurs is generalh' common. Localities are : 

 Iiivci-iicss-shirc : Strathgiass, Glencannich, and Insh 



* Entom., 1880, p. i8q. 



