PART IV 



THE PERLID.E, 1 &C. 



I HAVE now disposed of the two divisions 

 of the insect world with which the trout fisher- 

 man is mainly concerned, the EPHEMERID^E and 

 the TRICHPPTERA, and there remain a few flies 

 belonging to various groups which must not 

 be omitted from this book. The most im- 

 portant are the PERI.ID.E or stone-flies. With 

 the exception of a few of the smaller species, 

 they are not abundant on chalk-streams, but 

 are plentiful on rivers of other type. PERLID.E, 

 as a general rule, require a cold temperature, 

 and are more plentiful in the highlands than in 

 low-lying plains. Suffice it to state that on 

 our chalk-streams the only species occurring in 

 any quantities are Leuctra geniculata, Leiictra 

 klapdleki, Chloroperla grammatica, Nemoura 

 inconspicua, and Perlodes microcephala, of which 

 the first two pass under the name of the 

 willow fly ; the third, the yellow sally ; and the 

 last, the stone-fly. I have taken stray speci- 

 mens of Nemoura variegata, which frequents 

 lakes and still or sluggish ditches ; but it is 



1 Modern writers are inclined to remove the PERLID^E 

 from the NEUROPTERA and classify them as a distinct 

 order, the PLECOPTERA. 



