240 THE dry-fly' MAN'S HANDBOOK 



sometimes by triangular spots in some of the more 

 forward segments ; last segment altogether dark 

 above. The spiracular region is edged with an 

 irregular dark line above and an abbreviated line from 

 the base below, in every segment." 



Of E. lineata imago male he says : " The seg- 

 ments marked with longitudinal curved or slightly 

 sinuous black streaks tapering at the ends, the anterior 

 segments having each two long streaks on each side 

 of the middle of the back and the posterior segments 

 two short lines from the base between the two pairs of 

 streaks." 



Fig. 42 represents these markings on E. vulgata, 

 E. danica, and E. lineata? It is probable that the 

 angler will be able to identify these species from the 

 markings, and it may also assist him to know that 

 the subimago of E. danica is of a greener tint in 

 the wings and generally paler than the other two 

 species. E. vulgata and E. lineata in the subimago 

 stage are almost identical in colouring, slightly 

 browner in the wings and generally darker and slightly 

 larger than E. danica. 



I have given here two plates of the winged mayflies : 

 the first, the subimago male, in Plate XVI, and the 

 imago female in Plate XVI I. Both of these were drawn 

 from specimens of E. danica, but with the exception 

 of the colouration in the subimago and the markings 

 before referred to, the species are so similar as to 



1 I am indebted to the Rev. A. E. Eaton for his kind permission to 

 reproduce his drawing of the markings oi E. lineaia. 



