. Elementary entomology. Entomology. 340 ELEMENTARY ENTOMOLOGY of using this is to fit a cyanide or alcohol bottle over the lower end of the funnel, and sink the bottle and funnel in the ground level with the surface. This is particularly useful along the coast or in sandy localities where ground beetles are numerous. This will prove more effective for carrion beetles if a dead fish, mouse, or piece of meat is strung on a wire and laid across the funnel. The funnel is also used in collecting very small insects, like Thysanura. The simplest method is to take an ordinary glass funnel, from twelv
. Elementary entomology. Entomology. 340 ELEMENTARY ENTOMOLOGY of using this is to fit a cyanide or alcohol bottle over the lower end of the funnel, and sink the bottle and funnel in the ground level with the surface. This is particularly useful along the coast or in sandy localities where ground beetles are numerous. This will prove more effective for carrion beetles if a dead fish, mouse, or piece of meat is strung on a wire and laid across the funnel. The funnel is also used in collecting very small insects, like Thysanura. The simplest method is to take an ordinary glass funnel, from twelve to twenty-four inches in diameter, and place a cork stopper in the lower end of the neck. The neck is to be partly filled with alcohol. The funnel should then be placed in a basin with straight sides, which is partly filled with water. The basin may be of tin or granite ware, of slightly smaller diameter than the top of the funnel, but deep enough so that the neck of the funnel does not rest on the bottom. If the funnel is not heavy enough to prevent floating, it may be held in position by strips of lead laid across the top. This apparatus should then be placed over a gas flame or some other even heat, and the temperature of the water raised to between sixty and one hundred degrees. Since alcohol evaporates so rapidly, it should not be placed in the funnel until the apparatus is ready for use. The mate- rial containing the insects, such as leaves, decayed wood, etc., is next placed in a sieve, the diameter of which is slightly smaller than that of the funnel. The sieve is then placed over the top of the funnel, and the insects, attracted by the heat, rapidly work their way through the material and drop down into the funnel. The insects are removed from the funnel by taking out the cork stopper and allowing the alcohol to run out into a bottle. A very convenient time to collect these small insects is during the early fall or winter. Cotton-cloth bags may be used to gather up t
Size: 1311px × 1906px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
