250 



MONOGRAPH OF THE LABOULBENIACE^E. 



purposes of determination, should be mounted in tight pill-boxes on the herbarium 

 sheet, to avoid the depredations of Anthrenus and other pests of insect collections. 

 A little cotton in the box prevents the host, as well as its parasites, from being in- 

 jured by falling about when moved. Care should also be taken that the insect is kept 

 clean and free from dust particles or exudations from its own body. Otherwise, it is 

 often difficult or indeed impossible to detect the parasites when needed for examina- 

 tion. 



