It is a little cavity that opens in a small limestone lens included in metamorphic rocks. The hole has been used as depot of old furniture and equippings fall into disuse. In order to go in this cave, in fact, it's necessary to get over wardrobes and and broken cases. In the first part of the cave, where the ligh penetrate with difficulty, we can easy find troglophile spiders like Meta menardi on the vault, often females near their pendulous eggsacks. Among the stone on the floor or on the walls, the author observed the troglophile spider Pimoa rupicola. Among the insects there are numerous Sphodropsis ghilianii and the author discovered here a numerous colony of Coleoptera Cholevidae Leptodirinae of the genus Parabathyscia, determined as P. oodes, a new station of this insect widespread in the higher Po Valley in the cave "Buco di Valenza", a vertical cavity few kilometres far from the Hole of the Master. The author observed also rare specimens of Dolichopoda ligustica, troglophile grasshoppers, hidden in the crack of the rock. In the inner part have been found also troglophile snails, Oxychilus glaber that exploit the notable quantity of organic debrits generate by the numerous organisms that populate this little cave.

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