THE MARCH BROWN 



Family 



Genus 



Species 



EPHEMERID.E 



Ecdyurus 



venosus 



PLATE VI 



The 

 rather 



march brown (Ecdyurus venosus) is 

 a striking-looking fly, on account of 

 its size and the well- 

 defined marking of 

 its wings. The larva 

 is found under flat 

 stones in rapid 

 streams. So far as 

 I know, the march 

 brown has not yet 

 been observed on the 

 Hampshire chalk- 

 streams, but it occurs 

 in great numbers on 

 some of the northern 

 and western rivers at 

 the beginning of the 

 season. The imago 

 is the great red 

 spinner of Ronald's 



" Fly-Fishermen's Entomology." I give a figure 

 of the genitalia of the male (Fig. 12). Closely 

 allied to the march brown, and very similar 

 in the general appearance of its spinner, is the 

 autumn dun, 1 which occurs plentifully on the 



1 I have not yet been able to establish the identity of the 

 autumn dun. It is possible that more than one species has 

 been merged in Ecdyurus venosus, and further investigation, 



FIG. 12. Genitalia of 



Ecdyurus venosus, <J . 



Great red spinner. 



