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DIPTERA (TWO-WINGED ELlEs). 
Diptera may also be put away for transport in three-cornered 
envelopes of soft paper (newspaper), after the manner in which 
butterflies are packed by collectors ; but this method, though, it 
answers fairly well for Tipulidce, does not suit thick-bodied dies, 
such as Tabcmidce, as these are often crushed by it, and if once 
flattened cannot be restored to their natural shape. Envelopes 
containing Diptera or other insects may be conveniently packed in 
tin tobacco- or biscuit-boxes for transmission by parcel-post from 
abroad. A few drops of weak carbolic acid should be sprinkled 
over each layer of envelopes, and the box should be packed quite full. 
It is never advisable to put Diptera for transmission from abroad 
into small boxes containing wool, as when dies are once in contact 
with wool, and have become dry, it is very difficult to remove them 
without pulling off legs, bristles, etc. 
Pinning. 
