Plecoptera, aka Stone Fly, have only...

Plecoptera (Needle & Stone)

Plecoptera, aka Stone Fly, have only one rule for living, first quality water. For this reason, many waters are now devoid of it. Grayling and Trout love them. Fly-fishermen synthesize all the species, in respect of their size, into two types, the Needle with its slender wings almost enveloping the abdomen, and the one that characterizes in common jargon the Stone Fly, with its wings more voluminous and flat on the abdomen.