Lt'sti's. 237 



arranged roughly in three bands ; some specimens have 

 paler lamellae, these perhaps being females ; margins 

 provided all round with short spines ; lamelLt seem 

 rather thick and easily divided into two layers ; there 

 seem to be no proper trachea;, except perhaps a medial 

 one. Are the lamella; used for breathing? [Described 

 from empty nymph-cases obtained on Ockham Common, 

 when the insect was emerging. The colour was pale 

 russet-brown ; what it was in the living nymph I 

 cannot sa\'.] 



Date. 



About the middle of JuK' this species usualh' begins 

 to appear, though De Selys gives June for the British 

 Isles, and Mr. C. \V. Dale records it for North Uist, in 

 the Hebrides, in the same month. It is plentiful in 

 August and September ; while the author took it in 

 Surrey as late as October 2, in 1898. 



Habits. 



Flying low amongst the herbage by the sides of 

 ditches and ponds, this abundant little Dragonfly is not 

 very conspicuous. Unlike the Agrioiiidcc genera! h', it 

 rests with its wings half open. 



Distribution. 



Though this species is in all probabilit}- well dis- 

 tributed in the British Isles, records of its occurrence 

 are by no means numerous. Yorkshire : Thorne, and 

 Strensall Common (G. T. Porritt). Cheshire: Delamere 

 Forest district (J. Arkle;. Cambridgeshire : Everywhere 

 common (K. J. Morton) ; Littleport (C. A. Briggs). 



