S6 British Dragonfiies. 



course, this might have been only accidental. The 

 manner of flight resembled closely that of .S. sanguineiiin, 

 and somewhat that of .S". scoticum, but was by no means 

 so continued as that of S. striolatuiii. The saffron of 

 the wings was not very noticeable in flight, nor even 

 when the insect was settled. 



Migration. 



There is little doubt that in 1871 a considerable 

 migration of this species took place into the London 

 district, on which occasion Mr. McLachlan even saw 

 several examples in the Strand,* and Mr. H. Double- 

 day seems to hint at the same thing having occurred 

 on former occasions.t The }-ear 1898 witnessed 

 apparently another, though perhaps small, invasion, 

 which, from the localities recorded, may have come 

 across the North Sea. 



Distribution. //\//;7/,v^<.'' - 



Localities for this species in Britain are few. In 1871, 

 as already mentioned, it was very abundant in the 

 London District, and writing in the same year Mr. H. 

 Doubleday speaks of its having been very common in 

 certain years among the gravel-pits on Coopersale 

 Common, Epping, in August and September. In 

 August, 1888, Mr. G. T. Porritt took one specimen on 

 the Sandhills, near Dcal.X Mr. W. A Luff records 

 several at Grande Marc and L'Ancrcssc, in Gucrnse\', 

 about i89i.§ In 1898 this species was found in some 



* E. M. M., 1884, p. 253. t E. M. M.,11871, p. 86. 

 X E. M. M., 1889, p. 214. § E. M. M., 1892, p. 73. 



