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For many small insects, especially Microlepidoptera and Microdiptera, which must be pinned, even the finest ordinary insect-pins are too large, and two special makes of pins are in use for this purpose.

Dr. H. Dewitz mounts the larvæ and pupæ of Microlepidoptera, and also the early stages of other small insects, in the following way: The insects are put into a bottle with 95 per cent alcohol.

For collecting Microlepidoptera, in addition to the ordinary net, some special apparatus will be found very essential.

The necessity of rearing to obtain perfect specimens is even more important in the case of the Microlepidoptera than with the larger forms, and many species are very easily reared and can thus be obtained in quantity.

In the case of Microlepidoptera, their habit as larvæ, of mining leaves or tying or webbing them together, affords an easy means of detecting their presence in most cases.