300 



THE CANADIAN ENTOMOLOGIST. 



The results of the study of the candle-power, radiation and tempera- 

 ture measurements will be described at some future time, and it will be 



Fig. 27. — Spectral energ-j' curves of fire-Hj- and glow \vorni. 



sufficient to add that in a healthy fire-fly the abdominal segments contain- 

 ing the photogenic organ are at a higher temperature than the dark seg- 

 ments, whether or not the flashing is in progress. 



In conclusion, it may be added that for the first time we have sub- 

 stantial evidence that the colour of the light of various fire-flies is different; 

 the maximum emission of the 



Pyrophoriis noctihicus being at ^Z^l*- 



PJioturis pennsylvanica " " 552/^^. 



Photinus pyralis " " S^y/^t. 



P/iotifiiis consa7ig7iineus " " 578/*. 



Mailed October, 4tb, 191 1. 



