The modes of netting of web spiders each of which comprises three components (occupation of space, netting process and web-form) are divided into the following five types : (1) vertical orb-web type, (2) horizontal orb-web type, (3) cubic web type, (4) sheet web type, and (5) fixing web type. To occupy the scaffolding stand and space for netting, some competitive or cooperative relationships are found between the individuals having the same of different mode of netting, and through these coactions each web spider community in each habitat is organized. Eleven different community types, each corresponding to the difference of habitat (conditions and localities), are found. The correspondent habitats and community types are as follows : [table] Among these Ara, Ara', L, N, Arg, Tr, Th, U' types are considered to form a set of community types in a district and are named as "the community lump A", while N', L, Arg', Tr, Th, U types form another set, and is called "the community lump B." The communities belonging to lump A are distributed over Fastern Siberia, Sikhote Alin, Northern and Eastevn Hokkaido, Honshu, Sikoku, Kyushu, Yakulsle, Tanegashimalsle, etc, and the distribution areas of those belonging to lump B are Takaralsle, Kikailsle, Amamilsle, Tokunoshimalsle, Okierabulsle, Ooronlsle, Okinawalsle, Ishigakilsle, Iriomote Isle, stc.
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