220 THYSANOPTERA AIvTD ORTHOPTERA. 



could just be carefully beaten in three minutes. Each time the same 

 area was beaten and the results are given under ''Area No. 1" in Table 

 II below. To check the results obtained by beating the same area 

 many times, a second area was beaten each time; but in each count 

 "Area No. 2" was a different one from any other area recorded in the 

 same column. Temperatures were read just after making the counts. 



TABLE II. — Showing the number of grasshoppers flushed in three minutes on a 

 sand dune at different periods of one day. 



Time of making Temperature Number of grasshoppers flushed. 



count. in °C. Area No. 1. Area No. 2. 



Adult. Immature. Adult. Immature. 



7:35 a. m 22.4 4 7 3 



8:35 a. m 23.0 15 1 30 1 



9:35 a. m 24.2 12 1 23 



10:35 a. m 23.0 14 27 



11:35 a. m 22.8 9 1 22 



12:20 p. m 23.0 11 2 22 1 



2:00 p. m 22.0 9 1 15 1 



4:30p.m 23.8 9 1 20 



A third series of counts was made in a field of timothy and blue 

 grass stubble. The number of grasshoppers flushed while I walked a 

 distance of 30 yards east or west was determined. Adults could not 

 be distinguished from immature individuals. 



TABLE III. — Showing the number of grasshoppers flushed from a strip 30 yards 

 long in timothy and blue-grass stubble at different periods of one day. 



T... , e -r^- ^- c Maximum distance 



, ,. ,, Number of Direction of from path at which 



Time of making lemperature grasshoppers walking while ii^dividuals were 

 observations. in °C. flushed. flushing. flushed in feet 



7:30 a.m 21.3 178 east 2.0 



8:25 a. m. 22.1 213 east 3.5 



9:30 a. m 23.0 254 east 6.0 



10.35 a. m 24.1 263 east 6.0 



12:15 p. m ? 151 west 5.0 



1:.55 p. m 26.3 163 east 4.0 



3:15p.m.... 27.0 152 east 5.0 



