368 



ANIMAL COMMUNITIES 



Water-striders, scientific names: 



— Gerridae, 185. 



— Gerris: 



marginatus, 155. 

 rufoscutellatus, 155. 



— Mesovelia bisignata, 155. 



— Rhagovelia collar is > 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, 79, 

 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. 



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, 196, 244. 



Wood thrush, 241. 



Woodchuck, 215, 233, 236. 



Woodcock, 189, 191. 



Wood-frog, 244. 



Woodpeckers: 196, 274; downy, 229; 

 in beach drift, 219; red-headed, 242. 



Worms: flat, 20; round, 20. 



Wren: long-billed marsh, 171; short- 

 billed marsh, 181. 



Yellowlegs, 181. 



Yellowthroat, northern, 189, 262, 275. 



Zonation in forest edge, 263. 



FprintedI 



U_IN USA J 



