350 BRITISH SPECIES [CH. 



89 blue with black points, 10 black. $ abd 2228, hw 1822, pt 0-8, yellow ; 

 blue parts replaced by grey-green or reddish-brown; abd. with elongated 

 bronze-black markings on all segments. Very common. June Sept. 



The following reputed British species are not considered to 

 have established a satisfactory claim to be included in the above 

 list, either the determination or authenticity of the few captures 

 recorded being open to doubt: Gomphus flavipes Charpentier, 

 Lindenia forcipata Linn., Sympetrum meridionale Selys, Leucor- 

 rhinia pectoralis Charpentier, Lestes viridis Vanderlinden, Lestes 

 virens Charpentier, and Lestes barbarus Fabricius. 



LARVAE. 



It is impossible to give a complete classification of the larvae 

 of British species, partly because a number of them are still 

 unknown, and partly because, in one or two genera, the similarity 

 between the larval forms is so great that specific differences have 

 not yet been definitely established. The following table should 

 be used in conjunction with the characters given for the larvae 

 in chap. xiv ; and also with the figures of larval types and labial 

 masks (figs. 2942). 



ANISOPTERA. 



Subfamily Gomphinae. Gomphus vulgatissimus. Larva of type shewn 

 in fig. 36 B. Mask of type in fig. 32 D. Found in debris on the bed of 

 running streams. 



Subfamily Cordulegastrinae. Cordulegaster annulatus. Larva of type in 

 fig. 33, but with abdomen somewhat more elongated. Mask of type in 

 fig. 32 L. In debris on the bed of running streams. (The only British larva 

 with divergent wing-sheaths.) 



Subfamily A eschninae. Larva of type in fig. 29 A. Mask flat (figs. 29 D, 32 A) 



Genus Brachytron. Eyes small, rounded, placed well forward on head. 

 Mask in position of rest not reaching beyond second coxae ; lateral lobe with 

 narrow rounded apex. Anal pyramid short (length of seg. 10), the appendix 

 dorsalis truncated at tip (B. hafniense). 



Genus Aeschna. Eyes larger, hemispherical, occupying about half the 

 length of the head. Mask in position of rest as in Brachytron; lateral lobe 

 with broad squarish apex. Anal pyramid long (length of segs. 9 + 10), the 

 appendix dorsalis notched at tip. 



The five known larvae of this genus are best separated by the form of the 

 supracoxal armature, as shewn in fig. 180. The larva of Ae. coerulea is unknown. 



Genus Anar. Eyes very large and flat above, occupying two-thirds the 

 length of the head. Mask reaching back to beginnings of third coxae ; lateral 



