18 SCIENTIFIC SURVEY OF TURNER’S LAKE 
Trichoptera 
The Caddis-flies 
Stenophylax scabripennis Ramb. The adults of only a single 
species of caddis-fly were taken but empty cases of two or three dis- 
tinct types were noted in shallow water. A separate account of 
caddis-fly larvae found living with the fresh water sponge, is given 
in another place. ; 
Lepidoptera 
Moths, Butterflies etc | 
Larvae of Nymphula (Parapoynx) maculalis Clemens were com- 
monly found on the under surface of lily leaves, in cases made from 
fragments of the leaves ; in a few instances they were collected in the 
plankton net drawn at the surface. 
Diptera 
Flies. 
Plecia heteroptera Say. Many found in open swarms over the 
lake and along the road. 
Aedes stimulans Walk. No evidence was found to indicate that 
mosquitoes were breeding in the lake in spite of the great numbers 
flying over the water. Lake water in a half sunken boat held no 
larvae nor were the larval exuviae found in the shore litter or in the 
plankton net drawn at the surface. It is probable that the majority of 
the mosquitoes came from the nearby swamps. 
Coleoptera 
Beetles 
Gyrinus borealis Aube. 
Dineutes assimilis Aube. 
Galerucella nymphaeae (Linn.) Larvae on lily leaves. 
ARACHNIDA 
Hydracarine 
Water Mites 
(Identified by Dr. Roperr H. Wotcort, Lincoln, Neb.) 
Unionicola crassipes (Mull.) These mites are exceedingly abund- 
ant at a depth of thirty feet but were taken in lesser numbers at the 
surface and intermediate depths. 
Piona inconstans (Wolc.) Both sexes were taken at various 
depths down to thirty feet. 
