Kl'IIEMERIM OP THE CHALK STREAMS. 



Next as to conformation : To the casual observer the 

 general outline of every member of this family is exactly that 



of the Mayfly, 

 differing only in 

 size, and as the 



K 3W U<ts. appearance of the 



Mayfly should be 

 well known to all 

 keen fishers, the 

 subject may be 

 dismissed with 

 very few words. 

 What might be 

 described as the 

 "meaty" bit of a 

 Mayfly, from the 

 trout's point of 

 view, consists of 

 three separate 

 parts (i) head, 

 (ii) thorax , and 

 (iii) abdomen. 



fleli . 



(i) The head 

 consists of only 

 one segment, and 

 carries the very 

 small antennae 

 which are charac- 

 teristic of this 

 family, also the 

 eyes, which are of great importance as they are always a 

 clear indication of sex. Females have very small eyes placed 

 well to the sides of the head, whereas males possess highly 

 coloured large eyes covering the greater part of the head. 



(ii) The thorax is divided into three segments, and to each 

 segment is attached one pair of legs, making six in all. The 



