238 



IXSECTS INJURIOUS TO STAPLE CROPS. 



enclosure aud the way in which the tobacco is packed. 

 One ounce to every fifty cubic feet of enclosed space will 

 doubtless be ample. This should be placed in shallow 

 vessels on top of the tobacco aud allowed to remain for 

 twenty 'four hours. No injury will be done the tobacco. 



a. h e 



Fig. 135. — The Cigarette-beetle, a, larva; h, pupa; c, adult; d, 

 side view of adult: e, anteuna — all greatly enlarged; e, still 

 more enlarged. (After Chittenden, U. S. Dept. Agr. ) 



but care should be taken in the use of this chemical that 

 no light, cigar, etc., be brought near it, as it is highly 

 combustible and such carelessness might cause a serious 

 conflagration. 



Hydrocyanic acid gas has recently been used very suc- 

 cessfully by Prof. AY. G. Johnson in riddiug some large 

 tobacco warehouses of this pest. 



