28o BfitisJi Dragonflics. 



sharp, black projection pointing downwards and outwards ; 

 lower, somewhat similar in shape and colour, with pro- 

 jection pointing upwards and outwards. 



Female Imago. 



Eves greenish. Middle lobe of protJiorax not so 

 prominent as in male. Segment 2 of abdomen blue, 

 with a black-bronze spot much resembling that on the 

 second segment of the male of Agrion nierciir-iale ; 3 

 to 8 black-bronze, with a basal bilobed blue spot ; 9 

 and 10 bronze-black, with margins blue ; underside 

 yellowish, mid-ventral line black. In other respects, 

 and in general appearance, the female resembles the 

 male more closely than in the other British Agrions. 

 Anal appendages short, conical, black. Ovipositor 

 reddish, as long as the ninth and tenth segments. 

 Valves bluish. 



Immature Colouring. 



At first grey, then passing through lavender and 

 violet-blue to a cold cerulean-blue like the rest of the 

 genus ; wings with a slight brown tinge ; pterostigma 

 paler ; the black parts with a more decided bronze tinge. 



Variation. 



The stripes on the dorsal surface of the thorax vary 

 in development, and may or may not be interrupted 

 towards their basal extremity. The characteristic spot 

 on the second segment of the male varies, especially 

 in thickness, and the neck joining it to the circlet 

 behind may possibly be absent ; there is also great 

 difference in the development of the blue spots. A 



