The Redback Spider is a species from Australia that has established itself in Japan. The first one was found in Kumamoto last year in Tsuruhada (the northern part of Kumamoto City). This article reports that an additional 42 spiders and eggs have been found in that area recently. The city is advising wearing gloves when working in areas that spiders are likely to inhabit. For more information about the spider in English, see
Deadly red-back spider spreads across Japan http://ajw.asahi.com/article/behind_news/social_affairs/AJ201210180001
and
Redback Spider, Latrodectus hasselti http://australianmuseum.net.au/redback-spider
To find the city’s warning (in Japanese) go to
http://www.city.kumamoto.jp/hpkiji/pub/detail.aspx?c_id=5&id=3057
http://mainichi.jp/area/kumamoto/news/m20140823ddlk43040310000c.html