38 MAINE AGRICULTURAI. EXPERIMENT STATION. I903. 



Experiment 22. Five long-winged and fifteen short-winged 

 bugs were submerged for forty-eight hours after which nine 

 short-winged forms revived in from two and a half to six hours. 

 Only two however were able to walk about. 



Experiment 2}^. Eight long-winged and twenty-two short- 

 winged bugs were submerged for sixty-eight hours. After 

 being dry for eight hours only one long-winged and two short- 

 winged forms had revived and these were unable to make any 

 but very feeble movements. 



Experiment 24. Fifteen short-winged bugs were placed in a 

 tightly closed two-dram vial. In six hours they had ceased all 

 movements and lay as if dead. After twenty- four hours five were 

 taken out, but failed to revive at the end of three hours. After 

 forty-eight hours the other ten were taken out. They showed 

 no signs of reviving at the end of eight hours. 



Experiment 25. Fourteen long-winged bugs were placed in 

 a tightly closed two-dram vial. At the end of thirty hours all 

 were active. iM the end of fifty hours all were still able to move 

 about feebly. At the end of seventy-two hours all but one were 

 still able to move their legs feebly but not able to walk about. 

 They were taken from the vial and after about half an hour all 

 were able to walk about. 



Experiments 1-20 were performed during January and Feb- 

 ruary, 1902, and experiments 21-25 during October, 1902. 



CONCLUSIONS. 



From the foregoing observations and experiments the follow- 

 ing conclusions seem reasonable : 



The hibernation of the chinch bug is not a period of pro- 

 longed or continuous torpidity, but a period during which 

 the torpidity may be broken by warm weather, when the bug 

 becomes capable of active movements. 



Complete submersion in water, even for a considerable period 

 is not necessarily fatal. 



Freezing while submerged in water is almost surely fatal. 



Freezing while exposed to a dry atmosphere is generally fatal. 



Freezing in a moisture laden atmosphere is only occasionally 

 fatal. 



