Directions for Collecting and Preserving InsectsRiley, Charles V. (Charles Valentine)
Science
Directions for Collecting and Preserving Insects
Riley, Charles V. (Charles Valentine)
Insects -- Collection and preservation
The foregoing portions of this manual have dealt almost exclusively with
the subject of the securing and preservation of Hexapods, but it is
deemed advisable to include brief instructions for the collection and
care of the near allies of the true insect, Spiders and Myriapods, the
study of which will in most cases be associated with that of Hexapods.
DIRECTIONS FOR COLLECTING SPIDERS.
_Apparatus._--Many of the directions and methods given in the foregoing
pages for the collection of Hexapods apply also to the animals named
above. Little apparatus is necessary in the collection of spiders and
other Arachnids. The essentials are vials containing alcohol, an insect
net, a sieve, and forceps. Narrow vials without necks are best for
collecting purposes, as the corks can be more quickly inserted. They
should be of different sizes, from 1 dram to 4 or 6 drams, and the
alcohol used should be at least 50 per cent strong and in some cases it
is advisable to use it at a strength of 70 or 80 per cent. The net may
be of the same construction as that used to collect insects and is used
in the same way. Some arachnologists, however, use a net of a somewhat
different make, which is much stronger. The iron ring is heavier and
larger than in the case of the insect net, resembling in this respect
the ring of the Deyrolle net. The bag is short and the handle is
fastened to both sides of the ring. This net is used for beating the
leaves of trees, bushes, and grass. Dr. Marx uses a net which is already
described and figured under the name of the Umbrella Net (see p. 34,
Fig. 52). The sieve is the same as that described on p. 35, Fig. 54, and
is used to sift the spiders from leaves and rubbish, especially during
winter. A mass of leaves and other material is thrown into the sieve and
then shaken, the spiders falling through on a piece of white cloth,
which is spread under the sieve on the ground. Many hibernating
species can be readily secured in this manner. A forceps similar to that
described for the collecting of hexapods should be used to capture or
pick up specimens, for if handled with the fingers they are apt to be
crushed, especially the smaller forms. As soon as the collecting is
finished or the vial is filled a label should be placed in this last
indicating place and date of collection. Egg sacs and cocoons should be
collected in pill boxes and properly labeled, and if possible the adults
should be reared. Both sexes should be collected and descriptive notes
or drawings made of the webs as found in nature.
[Illustration: FIG. 129.--A ground Spider (_Oxyopes viridans_). (After
Comstock.)]
[Illustration: FIG. 130.--An orb-weaver (_Argiope argyraspides_ Walck):
_a_, male; _b_, female; _c_ and _d_, enlarged parts.]
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