PLECOPTERA NYMPHS OF NORTH AMERICA 133 
PLATE 4 
ipa Spare 
yi Ly Genet ae aie \ 
wet | 
Witt Hot ay 
WWE 
\ 
ww Wen \Vv 
svat \\V 
“pean 
Nena wwe . 
SEES \\ oy al Vl / 
ss Re 
- ea NN vii 
Perla bilobata 
Perlesta placida gn 
