PARASITES 377 



slow and should be continued for some time or until all roaches are elimi- 

 nated. Care should be taken not to get the poison into the animal cages. 



Silverfish. — These pests can be eliminated by dusting pyrethrum 

 powder or sodium fluoride about the places where they occur. Fresh 

 pyrethrum powder is the more effective in this case. 



Meal worms and other grain pests. — These can readily eradicated 

 by fumigating the grain bin or room with carbon bisulfide. One pound of 

 carbon bisulfide to each loo cu. ft. of space is recommended. It is well to 

 pour the liquid on a cloth and place it in a container in the bin or room. The 

 heavy fumes sink and penetrate the grain thoroughly. The sides and 

 bottoms of the rooms or bins should be as nearly air tight as possible, and it 

 is well to cover the bin, leaving it closed for from 36 to 60 hours. The 

 temperature should be between 75 and 90°F. for best results. 



BIBLIOGRAPHY 



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9. Dikmans, G. 1935. New nematodes of the genus Longislriata in rodents. J. 

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10. Dobrovolskaia-Zavadskaia, N., and N. Kobozieff. 1927. Sur les lesions des 

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