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By J. E. H Martin

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Extra resources for Collecting, preparing, and preserving insects, mites, and spiders (The Insects and arachnids of Canada)

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The sifted material placed in the wire baskets slowly dries out on the darkened upper part of the apparatus. The insects are attracted to the light and to the higher humidity in the bottom of the apparatus, which is a wide-mouth jar with a moist cloth in it. Check the jar for insects at least once a day and keep the cloth moist. Photoeclectors are slower than Berlese funnels (exposure for at least 2 weeks), but the material can be colleeted alive and then killed in the usual way, making it easier to mount than specimens killed in a liquid.

The lower part of the covering tapers to a ring, which is sewn in to hold a wide-mouth jar. ) baskets for holding the sample are suspended by hooks from the top of the frame. The sifted material placed in the wire baskets slowly dries out on the darkened upper part of the apparatus. The insects are attracted to the light and to the higher humidity in the bottom of the apparatus, which is a wide-mouth jar with a moist cloth in it. Check the jar for insects at least once a day and keep the cloth moist.

Bulbs of over 100 W may kill many of the light, sclerotized, slower moving arthropods, whereas bulbs of under 40 W take too long to produce satisfactory results. ) upper diam with a light bulb of 60 or 100 W process well in about 2 days. Samples of this size usually yield members of species that occur even sparsely in the habitat. A lid or hood that closes over the light bulb and the sample holder of the funnel is advantageous in several ways: the heating effect and desiccation gradient are more pronounced; organisms capable of jumping or flying out of the sample are prevented from doing so; contaminant organisms (particularly flying nocturnal insects that often carry mites) attracted to the light or to the odor of the sample in the -funnel are excluded; and funnels being used outdoors are protected against rain or other falling objects.

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