Xo. 629] HABITAT RESPONSES OF WATER-STRIDER 489 

 TABLE I IT 



hveiily-tive seconds in making the journey to the pool. 



Experiment XA'X/.— This gerrid jumps in a zigzag course toward 



jumping in a direction slightly oblique to its margin and gaining the 



Erperiment A'XX/1'.— This homipteron t:ikr. a po^iti.-,, ^.o that the 

 body is slightly oblique svith reference to the uiMi-iu ol' ilic j.ool. The 

 gen-id jumps along a straight path toward the water I'oi- two feet. It 

 now turns so that the long axis of the body is i)arallel witli the margin 

 of the pool. It jumps straight ahead for one yard, when it turns toward 



The results evinced in these experiments are typical 

 of the results obtained in many others not recorded 

 here, except a few which are indicated by tables. It is 

 noticed that tlio water-striders reached the pool much 



