MAYFLIES, DUNS AND SPINNERS 239 



segments varied with pitch-brown or very deep 

 brown-ochre, instead of with cinereous, their markings 

 sometimes confluent (leaving in the middle an ivory- 

 white triangle upon the hind margin of the segment 



E vtthaia 



Fig. 42. Dorsal Markings x 7 

 E. lineata 



E. danica 



pointing forwards) sometimes differentiated into an 

 abbreviated thin streak on each side of the dorsal 

 vessel at the base of the segment, flanked by a longer 

 and broader tapering streak which falls short of the 

 hind margin of the segment and does not extend to 

 the side. The larger of these streaks are represented 



