250 



British Dragon flies. 



tiny lateral posterior spine ; a medio-dorsal paler line 

 may just be distinguished, and on each side of it, rather 

 nearer the hinder edge of each segment, is a small pale 

 mark ; there is also a pale lateral line. The caudal 

 laniellie (Fig. 45) are 8mm. long, and of much the same 

 width throughout (about 2mm.) ; the tip is rounded, 

 and each lamella is divided into two parts ; the basal 



Fig. 46. — Largest Spine on Margin of Caudal Lamella oe 

 NVMPH OF Erythromma naias. 



(Very highly magnified.) 



half has the margin spiny (Fig. 46J, especially on the 

 upper edge of the central one and the lower edge of 

 the other two (for the outer ones are I'eversed in position) ; 

 the decided nick on the more toothed margin is very 

 noticeable. The apical half of the lamella has a fringe 

 of extremely fine hairs, and bears three transverse brown 

 bands and a lonLjituclinal one alon<r the median trachea, 



