Table 9a.--Prediction of hatching of Melanoplus bivittatus as to dates when 
QO to 100 percent will have hatched 
Current 
Average average 4 Effect of 
5-day maximum maximum 
interval temperature | temperature i — deviation | Sum of {| Hatching 
= a(t-€) datesl/ 
| 26 SBE Days 
March 2-6--- Ta yete} 
eee 31.0 
12-16--- Up ee 7 
17-21---4 48.7 
22-26--- 3750 
Hose 33.8 
April 1-5---4 By 55) 
6210-=—" 54.0 
eat andl 556 
16-20--- 64.6 
zoey 62.7 
26-30--- 68.0 
May eee 6616 
6210=2=41 62.7 
WWe15=-<4 66.9 
162202224 74.2 
Peo e524 73.6 
26-30----| 6725 : 
31- 4--- 320 ; 
June 5-9--- 75.8 
1/ Results of column 6, sum of a(t-t), added to or subtracted from 
dates in table 9b when O to 100 percent will have hatched. 
Table 8b.--Average and predicted hatching dates for Melanoplus bivittatus 
when O to 100 percent will have hatched 
Predicted date 
