94 College of Forestry 
INSECTA. 
Back-swimmer (Notonecta undu-  Predaceous Diving Beetle (Lacco- 
lata), common. philus maculosus), abundant. 
Water-strider (Gerris buenoi), Dragon-fly nymph (Aischna_ spe- 
common. cies). 
Small Water Bug (Belostoma  Dragon-fly nymph (Gomphus sor- 
flumineum), nymph, common. didus ). 
Water-scavenger beetle (Tropister- Damsel-fly nymph (Hnallagma spe- 
nus glaber), common. cies). 
Water-scavenger beetle (Philhy- Damsel-fly nymph (Hnallagma spe- 
drus cinctus), common. cies). 
III. Bulrush-Water Willow Type. (Figs. 5, 12, 19, 20, 21, 
28, 29.) 
Stations I; 1, 111? ® V, VII, X11 XI), Xe 
XXIII, XXV, XXVI, XXX,’ XXXITI, are examples of 
this type of habitat, which is not as exposed to the waves as is 
the boulder-bottom type. In area it may be as large as 300 by 
500 feet. The bottom is more or less covered with stones 
and boulders, but there are sandy spots here and there. The 
water varies from 1 to 4 feet in depth. Vegetation is greater 
in bulk than in type II, consisting of: 
American Bulrush (Scirpus ameri- Water Willow (Dianthera ameri- 
canus ). Cand). 
Lake 3ulrush (Scirpus  occi-  Pickerel-weed  (Pontederia  cor- 
dentalis). data). 
The principal differences between this habitat and the 
boulder type are the less exposed situation, the density of the 
vegetation, the deeper water and the sandier bottom. Such a 
habitat is particularly favorable for black bass, sunfish, rock 
bass, and others, because of the hiding and breeding places 
provided by the thick vegetation, the attachment for eggs by 
the roots and stems of the plants and the excellent feeding 
ground by the abundance of animal life, insect, crustacean, 
and mollusean. The largest number of mollusean species, 
39, occur in this type of habitat, including upwards of 15 
which are known to be eaten by bottom feeding fish. 
