362 
Water-striders, scientific names: 
—Gerridae, 185. 
—Gerris: 
marginatus, 155. 
rufoscutellatus, 155. 
—Mesovelia bisignata, 155. 
—Rhagovelia collaris, 98, 117. 
Weasel, 201. 
Weeds, avoided by aquatic animals 
during flood, 105. 
Weevils, 167. 
Wheel animalcules. See Rotifers. 
Whitefish: 76, 77, 82, 85; blackfin, 81, 
82; Hoy’s, 81, 82, 85; long-jaw, 70, 
80, 82, 85. 
Willow blossoms, visited by pollen- 
gathering insects, 224-25. 
Willow sawfly: large, 267; spotted, 267. 
Wildcat, 242. 
Wilting coefficient of soil, 158. 
ANIMAL COMMUNITIES 
Wind: influence on circulation in lakes, 
61; relation to light penetration, 63, 
to evaporation, 160, 162, 163. 
Wolf, 15, 167, 201, 236, 238, 245. 
Wood pewee, 106, 244. 
Wood thrush, 241. 
Woodchuck, 215, 233, 236. 
Woodcock, 189, ror. 
Wood-frog, 244. 
Woodpeckers: 196, 274; downy, 220; 
in beach drift, 219; red-headed, 242. 
Worms: flat, 20; round, 20. 
Wren: long-billed marsh, 171; 
billed marsh, 18r. 
short- 
Yellowlegs, 181. 
Yellowthroat, northern, 189, 262, 275. 
Zonation in forest edge, 263. 
