Kl'IIEMERID/E OF OTHER RlVERS. 13 



should In- a perfectly clear understanding that the appear- 

 ance of these insects is by no means confined to the chalk 

 M reams. They are liable to be found almost anywhere. 

 Conversely, the remainder of the E.phemeridu* which are 

 reviewed later under the heading of " Ephemeridae of Other 

 Uivers " are all more or less likely to be met with on a chalk 

 stream. Hence it is clear that the nature of a river will only 

 be a guide as to what manner of insect life may be expected in 

 prolusion, and the probability of coming across any of the other 

 species must never be overlooked. 



III. 

 KI'HEMEIUIXE OF OTHEE RIVERS. 



In a previous chapter we have dealt, as fully as is necessary 

 for all practical purposes, with those members of the 

 Ephemerida.' family which are of particular interest to the 

 dry-fly man. Their names, which, by the grace of Providence, 

 happened to be English names, were already well known to 

 every fisher, and though he may often have been a little 

 doubtful as to exactly where they should be applied in the case 

 of the natural insect, he was rarely at fault where the artificial 

 fly w r as concerned. 



In dealing with what might be called Wet-fly Ephemerida?, 

 that is to say, flies which do not as a rule flourish on chalk 

 streams, a new difficulty arises, a difficulty which robs the 

 study of much of its interest, namely, that most of the flies 

 have no pet-names, therefore they can only be referred to by 

 their high-sounding classical .titles, which have little meaning 

 and few associations for the ordinary fisher who, if his jaw 

 must be strained, prefers to have the job done by a heavy pipe 

 or a tough sandwich by the waterside, rather than by an 

 excruciating effort to pronounce the unpronounceable. 



As in the case of the chalk-stream flies, a great dividing line 

 can be draw r n between the genera with three set as and those 

 carrying only two. 



The first of the remaining three-prong crs is Ephemerella 

 notata, first* cousin to the Blue-winged Olive, from which it 



