MODIFICATION OF COLOR. 

 Table 90. Temperature and humidity conditions. 



197 



In these experiments 35 per cent died in the larval stage, 15 per cent in the 

 pupal, and 50 per cent emerged. The growth and development in the larvae 

 and pupae were not on the average hastened. There was a tendency in some 

 specimens toward a hastening of growth and in others toward a retardation, 

 but these extreme cases about balanced each other. 



The larvae were normal in size, but their coloration was modified as fol- 

 lows : The hypodermal color became a dull opalescent pink, and the basal ter- 

 gal spots were highly variable and often wanting, and always brown in color ; 

 the spiracular spots were small and variable, but never black ; the pronotum, 

 head, and legs were light brown in color, and the latter very light. 



The imaginal colors were strongly modified. The hypodermal color was 

 light yellow, and all spots were distinct and fusions between them were not 

 numerous. On the epicranium g and g' were separate in 70 per cent of the 

 variates and h and h' were wanting in 32 per cent. On the pronotum / and f 

 were absent in 89 per cent of the variates, and b, d, and e were absent in vary- 

 ing percentages. The elvtral stripes were reduced posteriorly and the anal 

 stripe was wanting in 94 per cent. Although the spots on the ventral sur- 

 face were small, they were all present. The general color appearance was 

 albinic, as is shown in the following table : 



Table 91. Color of beetles used. 



Empirical mode of parents 9 



Empirical mode of control 9 



Empirical mode in experiment. . . 7 



Modal deviation of parents o 



Modal deviation of control o 



Modal deviation in experiment. . 2 



