554 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



not hibernate. The insects did not appear to be especially plump and 

 heavy but they no doubt possessed some form of fatty or energy pro- 

 ducing tissue as shown by experiments that were made. Dr. Huxley 

 suggested that there might be such material stored in the bodies of 

 the insects which in a measure would obviate the necessity for hiber- 

 nating under certain conditions. 



Stored Up Energy 



It has been noted by several observers that these beetles cannot con- 

 tinue on wing for any great length of time and that if they are obliged 

 to turn often, as in trying to escape from a room, they soon fatigue. 



Five beetles that were captured the day before on spinach were 

 turned loose in a room 36 x 60 and kept on wing until they could not 

 be stimulated to take to wing. Feather dusters, horns, squawkers and 

 lifters were tried as a means of keeping them on wing but the most 

 satisfactory results were obtained from the use of a small hand bellows. 

 A piece of cloth saturated in camphor was tied over the nozzle. A 

 beetle was considered fatigued when this appliance failed to make it fly. 

 One of the males was fatigued in eleven minutes and the other one in 

 sixteen minutes while it took twenty-two minutes to fatigue one female, 

 twenty-six minutes for another and thirty-two minutes for the last. 



On another test under similiar conditions (November 6) with five 

 females, they were fatigued with an average time of twenty-two min- 

 utes. These were fed on spinach three days and then fatigued in an 

 average time of twenty-six minutes. After a fast of five days they 

 were able to stay on' wing twenty-eight minutes. 



December 17 five males were fatigued with an average of sixteen 

 minutes, but one of them was fatigued in eight minutes while it took 

 twenty-four minutes to fatigue another one. 



December 19 five females that had been without food for about two 

 weeks were fatigued in thirty-two minutes. 



As there seemed to be a steady gain in ability to keep on wing after 

 fasting, records were kept to show how long they had fasted with their 

 average time. This was known as Lot 1. A fresh lot of five was 

 brought in from a turnip patch December 20. This was known as 

 Lot 2. 



Lot 1 



Dec. 19 Fatigued in 32 min. after fasting 14 days. 



20 " " 30 " " " 15 " 



21 " " 34 " " " 16 " 



22 " " 31 " " " 17 " 



24 " " 34 " " " 19 " 



25 " " 38 " " " 21 " 



27 " " .33 " " " 23 " 



28 " " 33 " " " 24 " 



29 " " 36 " " " 25 " 



30 " " 35 " " " 26 " 



31 " " 38 " " " 27 " 



