Even easier and cheaper:

> Bees collected from the hive were chilled in a freezer for up to 10 min to cold-anesthetize them for ease of handling. -- Activity-Dependent Changes to the Brain and Behavior of the Honey Bee, Apis mellifera (L.)

> Alloway found that beetles exposed to cold during retention intervals of 1, 3, 4, 5, and 10 days retain maze learning better than beetles left at room temperature for similar periods after learning -- LEARNING AND MEMORY IN INSECTS

> Neither bumblebees nor hivebees lose their memory on being etherized -- Do Anesthetized Bees Lose Their Memory? O. E. Plath. Source: The American Naturalist, Vol. 58, No. 655 (Mar. - Apr., 1924)

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