Acta Arachnologica
Online ISSN : 1880-7852
Print ISSN : 0001-5202
ISSN-L : 0001-5202
Volume 24, Issue 2
Displaying 1-6 of 6 articles from this issue
  • Seisho SUZUKI, Masahisa OHRUI
    1972 Volume 24 Issue 2 Pages 41-50
    Published: 1972
    Released on J-STAGE: March 29, 2007
    JOURNAL FREE ACCESS
    Twelve species of opilionids belonging to 11 genera of 4 suborders were recorded from the Izu Peninsula, Central Japan. Among these, seven species, six genera and two suborders have not yet been recorded from the Peninsula. Three interesting species were figured, and the penis of Sabacon dentipalpe SUZUKI was first illustrated. The species recorded are as follows (newly recorded ones are asterisked):
    *1. Suzukielus sauteri (ROEWER)
    2. Idzubius akiyamae (HIRST)
    3. Pseudobiantes japonicus HIRST
    *4. Sabacon dentipalpe SUZUKI
    *5. Oligolophus aspersus (KARSCH)
    6. Leiobunum japonicum MÜLLER
    *7. Pseudoleiobunum japanese MÜLLER
    8. Nelima genufusca (KARSCH)
    *9. Nelima sp.
    10. Gagrella japonica japonica ROEWER
    *11. Paraumbogrella huzitai SUZUKI
    *12. Systenocentrus japonicus HIRST
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  • Takeo YAGINUMA
    1972 Volume 24 Issue 2 Pages 51-59
    Published: 1972
    Released on J-STAGE: March 29, 2007
    JOURNAL FREE ACCESS
  • Experiment on effectiveness as a predator of Agelena opulenta L. KOCH
    Izumi KAYASHIMA
    1972 Volume 24 Issue 2 Pages 60-72
    Published: 1972
    Released on J-STAGE: March 29, 2007
    JOURNAL FREE ACCESS
    1)Grass spiders generally prey upon larvae of Hyphantria cunea DRURY. When these larvae shift from aggregation to the independent life, many larvae shift in high speed on thin branches and some on them lose footing and fall down like rain fall. These larvae fall on sheet like nests of grass spiders and spiders prey upon them. The shifting of these larvae is performed in the night.
    2)Where Hyphantria cunea DRURY is distributed, grass spiders are also distributed.
    3)Since the individual of grass spiders is too many, it is possible to collect its required number for affected mulberry farm in a short period of time.
    4)Although the breeding of grass spiders is possible, it is hard to reproduce many at the present stage.
    5)Grass spider does not harm on the growth of mulberry trees.
    6)In the chemical spray, grass spiders escape quickly to the tunnel made at the end of sheett like net so that few of the are killed.
    7)Because in the mulberry farm the number of grass spiders is not enough to control Hyphantria cunea DRURY in natural condition, we should liberate grass spiders each time.
    8)When grass spiders are used as a predator for Hyphantria cunea DRURY we can not control entirely but we can reduce the damage slightly.
    9)When we liberate a reasonable number of grass spiders in the mulberry farm every year, we can get a successful result as reported in this paper.
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  • Koichi SEKIGUCHI, Tsukané YAMASAKI
    1972 Volume 24 Issue 2 Pages 73-81
    Published: 1972
    Released on J-STAGE: March 29, 2007
    JOURNAL FREE ACCESS
    A description of a meagerly known whip-scorpion species, “Trithyreus sawadai KISHIDA, 1930”, which is now regarded as a species of the genus Schizomus, is given for the first time. In spite of insufficient original treatment which was presented only by figures, the specific name has still validity in the Zoological Nomenclature. Originally this animal was found from “the Bonin Islands”, but this time it was exclusively discovered from Chichi-jima Island in the same Islands. It may be allied to “Trithyreus” luzonicus HANSEN known from Luzon in the Philippines, but can be distinguished by the shape of flagellum of both sexes from all the other “Trithyreus” hitherto known.
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  • Genera Falcileptoneta and Masirana, Leptonetidae
    Toshihiro KOMATSU
    1972 Volume 24 Issue 2 Pages 82-85
    Published: 1972
    Released on J-STAGE: March 29, 2007
    JOURNAL FREE ACCESS
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  • D. K. CHAKRABARTI, A. K. BHADURI, D. N. RAYCHAUDHURI
    1972 Volume 24 Issue 2 Pages 86-90
    Published: 1972
    Released on J-STAGE: March 29, 2007
    JOURNAL FREE ACCESS
    This paper describes one new species, Cosmochthonius bengalensis and a new subspecies, Malacoangelia remigera indica from West Bengal.
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