vm, D. 1 



Jones: The Cigarette Beetle 



Copulation has been observed repeatedly in the laboratory and 

 under natural conditions in the factories or warehouses, and 

 takes place in from two to five days after the adults emerge. 



The life of the beetle is determined more largely by the amount 

 of energj' stored at the time of emergence than by the external 

 conditions, as is the case in many other insects. Table VI shows 

 that the beetle in the adult stage consumes no food and that the 

 average life is the same whether kept with or without tobacco. 



Table VI. — Length of life of adults. 



WITHOUT TOBACCO. 



Date emerged. 



Number 



of 

 adults. 



Died. 



Lived. 



Remarks. 



Date. 



Number 



of 

 adults. 



September 18 to 21 .. 



17 



September 28 — 



October 1 to 16 



October 20 



2 

 13 



2 



Days. 



8 

 •16.4 



30 



Large larvae were col- 

 lected from cigars; pu- 

 pated and emerged in 

 the laboratory. Adults 

 kept collectively copu- 

 lated, and laid eggs. 





KEPT WITH TOBACCO. 



August 20.- 



5 



September 4 to 6 



October 14 



5 



-• 



•16 

 15 

 21 

 13 

 12 

 14 

 18 

 11 

 26 

 10 



Adults kept singly. 



Examined daily. 

 - These were bred from 



eggs, and reared in the 



laboratory. 



September 29 



Do 



October 20 



October 1 



October U.- 



Do 



October 17 



October 6 



October 20 



Do 



October 24 



October 9 



October 20 



Do 



November 4 



do 



October 24 







•ATerage. 



Seasonal history. — This insect shows a continuous breeding 

 period. Eggs, larvae, pupae, and adults can be found at any 

 time of the year in tobacco warehouses and factories, but March 

 and April seem to be the months of the greatest abundance of 

 adults. 



