SOME TROUBLESOME INVADERS 385 



should be removed and the floors washed thoroughly with 

 strong soapsuds. The old wall paper should be removed 

 as completely as possible and the walls washed before 

 repapering. It would be advantageous to spray the walls, 

 especially around the window casings, with benzine or 

 gasoline. Where possible, carpets and bedding should be 

 steam cleaned. In country homes this is not always 

 possible and here the carpets should be hung in the sun 

 and brushed repeatedly and finally sprayed thoroughly 

 with benzine or gasoline. 



The infested rooms may be fumigated with sulfur, 

 at least 2 pounds to 1000 cubic feet of space, with the 

 room closed tightly and the cracks and openings calked 

 as already explained. 



Fumigation with hydrocyanic acid gas as detailed in 

 a later chapter will also be found effective in destroying the 

 pests. 



References to Economic Literature on the Psocids 



1840. Westwood, J. — Introduction to the modern classification 



of insects, Vol. II, p. 17. 

 1885. Lintner, J. A. — Atropos divinatoria. Second Rept. Ins. 



N. Y., pp. 198-203. 

 1888. Riley-Howard. — A house infested with Psocidse. Insect 



Life, Vol. 1, p. 144. 

 1895. Comstock, J. H. — The Corrodentia. Manual for the 



Study of Insects, p. 98. 



1895. Sharp, David. — Psocidse. Cambridge Natural History, 

 Vol. V, pp. 390-398. 



1896. Marlatt, C. L. — The book-louse. Bull. 4, n.s., Bu. Ent., 

 U. S. Dept. Agri., p. 79. 



1905. Kellogg, V. L. — Book-lice, etc. American Insects, p. 111. 

 For more general literature on the Psocidae see Lintner's Second 

 Report, p. 203, and McLachlan's papers. 

 2c 



