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Detailed instructions for making a Malaise trap can be found here:
Townes, H. 1962 Design for a Malaise trap. Proc. Ent. Soc. Wash. 64(4):253-262
and
Townes, H. 1972. A light-weight Malaise trap. Ent. News 83: 239-247.
The 2nd paper describes a trap that is lighte rand easier to make.