Now, the beetle has passed this way; with its subtle sense of smell it has recognised the ground as favourable; for its burrows are numerous.

Let us dig, then, in the neighbourhood of these holes.

The sign is reliable; in a few hours, thanks to the signs of the Bolboceras, I obtain a handful of specimens of the _Hydnocystis_.

It is the first time I have ever found this fungus in the ground.

Let us now capture the insect--an easy matter, for we have only to excavate the burrows.
The same evening I begin my experiments.