2IO 



COLORATION IN LKPTINOTARSA. 

 Table 97. — Temperature conditions. 



Conditions— 



7 a. m. 



10 a. m. 



I p. m. 



3 p.m. 



8 p.m. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 



Deviation 



from 



normal. 



In control 



In experiment. . 



20 

 23 



24 

 28 



32 



40 



25 

 32 



21 

 29 



35 



43 



18 



20 



24.4 

 30-4 





In the experiment 9 per cent died in the larval stage, 21 per cent in the 

 pupal, and 70 per cent emerged. In both larvae and imagines the coloration 

 was unmodified, as is shown for the adults in the following table : 



Table 98. — Coloration of adults. 



Class 



10 



II 



12 



13 



14 



15 



p.ct. 



16 

 P.ct. 





P.ct. 



P.ct. 



P.ct. 



P.ct. 



P.ct. 



Parents 





3 



4 



7 



16 



50 



20 



Control 





I 



5 



8 



18 



46 



22 



Experiment. . 



I 



2 



5 



7 



16 



45 



24 



Empirical mode of parents 15 



Empirical mode of control 15 



Empirical mode in experiment .. . 15 



Modal deviation of parents o 



Modal deviation of control o 



Modal deviation in experiment. . . o 



Experiment 29.— To determine the effects of a considerable average increase in tem- 

 perature upon the coloration of L. signaticollis. 



Conditions. — ^Temperature on the average 12° C. above that in the control, 

 with other conditions normal. 



Apparatus. — The same as in experiment 2^. 



In this experiment the material was the same as that used in experiment 28. 

 Nine hundred larvae from three generations were subjected to experimenta- 

 tion under the following conditions : 



Table 99. — Temperature conditions. 



Conditions— 



7 a. m. 



10 a. m. 



I p. m. 



3 p.m. 



8 p.m. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 



Deviation 



from 

 normal. 



In control 



In experiment. . 



20 

 30 



24 

 32 



° C. 

 32 



44 



° C. 

 25 

 39 



° C. 

 21 



37 



° C. 

 35 

 46 



18 

 25 



° C. 

 24.4 



36.4 



° C. 



t ^ 

 + 12 



In this experiment 34 per cent died in the larval stage, 56 per cent in the 

 pupal, and 10 per cent emerged. In both larvae and imagines a small increased 

 variability was found, but there was no modal change, as may be seen in the 

 table 100. 



