MODIFICATION 01? COI.OR. 



189 



In these experiments 6.3 per cent died in the larval stage, 8.7 per cent in the 

 pupal, and 85 per cent emerged. The coloration of the larvae was a deep wine 

 red, and all dark spots were large and of a polished black. On the tergae the 

 inner tergal spots were quite uniformly present. The imagines were either 

 normal in size or slightly large. The hypodermal color was a strong ocher 

 yellow, tinged frequently with red. The dark markings, which were large 

 and frequently fused, were of a dense black color. Their general appearance 

 was melanic, as is shown by their seriations in the following table: 



Tabi,^ 75. — General color of beetles used. 



Class 



5 



6 



p.a. 



7 

 P.ci. 



8 

 F.ct. 



9 

 PM. 



10 



Pci. 



Pci. 



12 

 Pci. 



13 

 Pci. 



14 

 Pfi. 



15 



Pci. 



16 

 P.ci. 





P.cL 



Parents 



I 



2 



5 



20 



42 



18 



9 



2 



I 









Control 



2 



7 



8 



17 



37 



19 



8 



I 



I 









Experiment . . 







I 



I 



5 



6 



18 



40 



19 



8 



I 



I 









Empirical mode of parents 9 



Empirical mode of control 9 



Empirical mode in experiment. ... 12 



Experiment 17. 



Modal deviation of parents o 



Modal deviation of control o 



Modal deviation in experiment . . +3 



■To determine the effect of a large increase in relative humidity upon 

 the coloration of L. decemlineata. 



Conditions. — Relative humidity on the average 21 per cent above that in 

 nature, with other conditions normal. 



Apparatus. — The same as in experiment 16. 



In these experiments, which were conducted during the years 1898 to 1904, 

 3,500 eggs were used, from which were hatched 3,100 larvae. The conditions 

 of experimentation were as follows : 



Tabi,E 76. — Humidity conditions. 



Humidity— 



7 a.m. 



10 a. m. 



I p. m. 



3P-m. 



8p.m. 



Maxi- 

 mum. 



Mini- 

 mum. 



Aver- 

 age. 



Deviation 



from 

 normal. 



In nature 



In experiment . 



Per ct. 

 *ioo 

 *ioo 



Per ct. 



65 



85 



Per ct. 

 50 

 85 



Per ct. 



100 



90 



Per ct. 



*IOO 



^-100 



Per ct. 

 100 

 100 



Per ct. 

 82 



Per ct. 

 74 

 95 



Per ct. 

 



+ 21 



*Dew. 



In these experiments 12.4 per cent died in the larval stage, 17.6 per cent in 

 the pupal, and 70 per cent emerged. The larval color pattern was changed in 

 that the hypodermal color became paler, and had a translucent appearance and 

 the dark spots were not as large nor were the dorsal areas as well developed. 

 The imaginal color was also modified, the hypodermal color being pale yellow, 

 with the dark areas smaller than is normal and with few fusions. In size the 

 beetles were normal. The general color tendency was albinic, as is show^n in 

 table 7"/. 



