These averages or multipliers can be used in setting up tables for predict- 
ing hatching dates for each of the four species, employing deviations from 
current maximum temperatures. The current maximum temperatures can be obtained 
from the Weather Bureau station. Information in these tables can be used to 
supplant or supplement field observations. 
Table 1.--Average number of days in each instar 
Instars 
Melanoplus species 
Days Days 
SaneuinUpes oreo 44 
bivittatus----------- 49 
differentialis------- 42 
femurrubrum---------- 
Table 2.--Specimens of Melanoplus differentialis collected in each stage of 
development 
nian ee See See 
Items 
Days in each stage 
number== | 
Specimens collected 
Total specimens 
collected----percent- 
Table 3.--Days after May 31 when certain percentages 
of Melanoplus differentialis had hatched 
ONOFOWUAO™N O 
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