. Bulletin - United States National Museum. Science. 126 BULLETIN 67, UNITED STATES NATIONAL MUSEUM. or rotten wood, etc. The millipedes, or Diplopoda (fig. 188), are very remote from insects. They have a hard, round, or flattened body of many rings, and each ring bears two pairs of legs. Their mouth-parts are weak, and they feed on vegetation or decaying matter. None of them can bite. Most of the directions given for collecting insects apply to these groups. They are treated as alcoholic insects, but not so much apparatus is needed. A net is useful; a fine forceps is necessary, and a sieve ne
. Bulletin - United States National Museum. Science. 126 BULLETIN 67, UNITED STATES NATIONAL MUSEUM. or rotten wood, etc. The millipedes, or Diplopoda (fig. 188), are very remote from insects. They have a hard, round, or flattened body of many rings, and each ring bears two pairs of legs. Their mouth-parts are weak, and they feed on vegetation or decaying matter. None of them can bite. Most of the directions given for collecting insects apply to these groups. They are treated as alcoholic insects, but not so much apparatus is needed. A net is useful; a fine forceps is necessary, and a sieve net is very handy to get the small forms. All of these should be collected in vials of alcohol of about 60 per cent and later put in 75 or 80 per cent alcohol, with a little glycerin. The mites can be obtained by sifting leaves and moss, and under boards, in fungi, and on foliage. The egg sacs or cocoons of spiders can be collected in pill boxes. In collecting spiders one should learn to distinguish the adults from the young. The mature male has the tip of the palpi developed into a complicated accessory genital apparatus. The mature female has the vulva or genital opening exposed at the base of the venter of the abdomen. Spiders not having either of these two characters are immature. It is useful to collect the immature stages of spiders, but if one does not know the differ- ence he is apt to gather a great number of young specimens. When one finds a spider in the young condition he may be able, by visiting the spot later, to find some adult specimens. Most Arachnids and Myriopods should be kept in corked vials of alcohol with a little glycerine, just as alcoholic insects. Empty cigar boxes or Marx trays, made for a double row of vials, are suit- able for arranging collections. The labels should always be inside of the bottles. Many mites are better when mounted in balsam or glycerin on slides. This is done as for mounting small insects. be killed in hot water or acetic acid of
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