A SYNOPSIS OF THE BRITISH DRAGON-FLIES. 51 



Genus Cordulegaster, Leach. 



21. C. annulatus, Latr. ; Steph. ; Evans, pi. 13; Revue, 



p. 104. 



Length 32 lin. ; exp. 42 lin. 



Habitat England, Scotland, Ireland. 



Large, black; thorax with eight yellow stripes; ab- 

 domen with the median segments yellow ; back of 

 the head yellow ; costal nervure yellow outwardly ; 

 upper lip yellow. 

 C. bidentatus, Selys ; Revue, p. 107. 



Length 30 lin. ; exp. 40 lin. 



Very similar ; back of the head and costal nervure 

 black ; upper lip yellow, edged with black. 



In Belgium. 



Fourth sub-family. Eyes completely contiguous. 



^SCHNINA. 



A. Anal angle of the posterior wings acute ( $ ) 



OR ROUNDED ( ? ). 



Genus zEschnia, Fabr. 



22. M. pratensis, Miiller (yernalis auctorum) ; Revue, 



p. 113. Charp.pl. 21. 



Length 26 lin. ; exp. 34 lin. 



Habitat England, Scotland, Ireland. 



Brown, very hairy ; thorax with two yellow bands in 

 front ; abdomen almost cylindrical, attenuated towards 

 the end, spotted with blue ( $ ) or yellow ( ? ) ; anal 

 appendages of male long, triangular, with the end 

 obtuse, the lower very short, truncate, emarginate, tri- 

 angular; pterostigma long, eery narrow; accessory 

 membrane small ; anal angle of the posterior wings 

 but slightly angular in the male. 

 e2 



