To clarify web site selection by redback spider, we examined the change in their number inhabiting the guardrails and guard-pipes on paved or unpaved waysides and with or without streetlight in study area. Redback spider was found on guardrails and guard-pipes same as in other artificial structures, such as the gutter, flowerpot, and around the building structures in the study area. They wove their web under the guardrails and guard-pipes on paved wayside of the road with streetlight, and they were seldom observed on those without streetlight and those on unpaved wayside. The abundance of prey arthropods did not differ significantly between around the guard-pipe on paved and unpaved wayside. In the laboratory examinations, the adult female could establish their webs in plastic chamber, but they could not establish webs in the chamber covered with fine sand on the floor for lack of sufficient strength to support their web lines. Redback spider favored to inhabit in artificial environments that lightened up and paved but they avoided to unpaved environments covered with soil, sand, and vegetation, because such environments could not provide sufficient support for their web line.
