VIII Contents 



Chapter VII. Analysis of Hetebogeneitt in Some Simplest Chabactebs. 



Page. 



Analysis of Heterogeneity in Some Simplest Color-Characters 192 



Analysis of Heterogeneity in Some Simplest Structural Characters 216 



Chapter VIII. Analysis of Heterogeneity in Complex Chabactebs. 



Composition and Modification of the Pronotal Pattern 237 



Composition of the Complex Pattern 243 



Chapter IX. Analysis of Heterogeneity in the Population. 



In Leptinotarsa multitwniata 270 



In Leptinotarsa undecimlineata 307 



In Leptinotarsa decemlineata 317 



Some Results of These Analyses 322 



Pattern in Different Habitats 324 



Effects of Transportation into a New Habitat 326 



THE RELATION OF WATER TO THE BEHAVIOR OF THE POTATO 

 BEETLE IN A DESERT. 



Introduction ^^^ 



Instrumentation and Conditions of Experiment 343 



Materials 3" 



Role of Water in the Reproductive Activity 346 



Experiments with Soil Moisture 348 



Experiments with Evaporation Rates 349 



Role of Water in the Preservation of Life 350 



Relation of Water Loss in Insects when Exposed to Changes in the Relative 

 Humidity of the Surrounding Medium and its Effect on the Activities 



of such Organisms 354 



Experiments upon Evaporation, Transpiration, and Behavior. 355 



Role of Water in Hibernation 366 



Entrance into Hibernation 366 



Activities 'wring Hibernation 371 



Water Relation of Soils and Hibernating Beetles 371 



Emergence from hibernation 372 



Summary and Discussion upon the Relation of Water to Hibernation 373 



Effect of Changes in Water-Content upon Alterations in Tropic Activities. . . . 375 



Experiments upon the Role of Water in Geotropism 376 



Relation of Temperature to Outgo and Intake of Water 377 



Metabolism and the Water Relation 378 



General Discussion upon the Role of Water in Living Things 379 



Summary and Conclusion 381 



Bibliography 382 



