188 THOMAS SAY FOUNDATION 
PLATE 32 
FIGURES 223-226 
223 <Acroneuria ruralis Hagen 
Nearly uniformly yellowish brown; occipital ridge present; wide 
pronotal flanges; cerci as long as, or longer than body; no caudal 
gills. 
224 Acroneuria pacifica Banks 
Blaze or white elongate mark in front of anterior ocellus; body 
nearly concolorous; copious anal gills; Western. 
225 Perlinella drymo Newman 
Long head; small eyes; oval pronotum; very long gills; wing pads 
with rounded sides; anal gills absent. 
226 Nemoura sinuata (7?) Wu 
Uniformly brown, spiny and stocky body; gills at throat; hind wing 
pads diverge greatly from body. 
