I’ve built a patio in the garden and it has benches consisting of cemented concrete blocks with wood on top. These are hollow so that we can store things inside them. Anyway, I lifted the lid of an empty one and spotted three of these strange beasts inside.

Order: Orthoptera; Family: Rhaphidophoridae;
Camel cricket: Diestrammena japonica: madarakamadouma
Body length = 20-25mm
Wingless – related to cave crickets

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Information in Japanese: Saitama Zoo