2! 



disturbance of the sand layer during this period may expose 

 the seeds and so enable these beetles to reproduce. A third 

 precaution is to have the sand layer at least a couple of 

 inches thick to ensure that slight disturbances do not expose 

 the seeds in any way. It is also necessary to see at frequent 

 intervals that the sand layer is intact. 



There is reason to believe that this remedy has a wider 

 application than to pulse beetles, for the instinct on which it 

 is based must be the means by which other stored grain 

 insects as well secure copulation and reproduction unham- 

 pered. The same instinct has been found to direct to the top 

 surface such widely differing species as Triholium castaneum. 

 Lasioderma serricorne, Calandra onjzcB, Gibhium scotias., 

 Rhizopertha dominica. Experiments have, however, not 

 progressed far enough, nor is this bulletin the appropriate 

 place, to record whether the sand layer would be effective 



Fia. 16. — BruchuB analis. 



against these and other species or whether other devices have 

 to be made to utilize this instinct in their destruction. It 

 may be stated, however, that the instinct is likely to 

 furnish in every case an easy means of controlling these 

 pests. 



Since the discovery of the method described above, the 

 announcement has been made that it has been discovered 

 in Pusa also. We have not yet had any detailed description 

 of experiments which resulted in the discovery there. It 

 would be interesting to know the line of investigation carried 

 out there which has yielded the same result. 



Other Forms in Stored Pulses. 



There are at least three other forms to be found in stored 

 pulses in the State. The more common one is B. analis, 



