Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] PRESERVING AND STUDYING INSECTS 353 having either end extend up above the top of the bottles. This allows the trays to be stacked one above another without injuring the bottles. Numerous substitutes for alcohol have been employed, of which a 4 per cent solution of formaldehyde is probably the best, as it is cheaper, tends to preserve the color, and does not harden the — . . _ » ^ ! _ i j. I J *.— i _ 1 i i i ^ ^ ^ ^ l\ N— - _ «— 1 _. - j — _ | 4 _ ' \ FIG. 489. The Marx tray for specimens in liquid spec
Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] PRESERVING AND STUDYING INSECTS 353 having either end extend up above the top of the bottles. This allows the trays to be stacked one above another without injuring the bottles. Numerous substitutes for alcohol have been employed, of which a 4 per cent solution of formaldehyde is probably the best, as it is cheaper, tends to preserve the color, and does not harden the — . . _ » ^ ! _ i j. I J *.— i _ 1 i i i ^ ^ ^ ^ l\ N— - _ «— 1 _. - j — _ | 4 _ ' \ FIG. 489. The Marx tray for specimens in liquid specimens. This, however, is not much superior to alcohol, and in many cases shrinks the specimens more than alcohol would. Material intended for dissection may be treated as above, but if alcohol is used, should be permanently preserved in 70 to 85 per cent alcohol, to which 10 per cent of glycerin has been added. Inflating insect larvae. The larvae of most of the Diptera, Coleoptera, and Hymenoptera are preserved in alcohol, as noted above. It has been found, however, that lepidopterous larvae may be preserved much better by inflating them, the method of which is as follows : The larvae are brought to the laboratory alive, and when ready to be inflated are killed or stupefied in a cyanide bottle. This method will be found much better than killing the larvae in the field, as they should be blown as soon as possible after they are killed. Remove the larva from the cyanide bottle and place it on a piece of blotting paper. A glass tube or pencil is next rolled over the body from the head toward the tip of the abdomen. This causes the alimentary tract to protrude, which is then snipped off at the anus by a pair of sharp-pointed scissors. FIG. 490. Homemade apparatus for inflating larvae (After Washburn)
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