The implements of excavation, the claws of the fore-feet, have their points covered by little globules of mortar; the others bear leggings of mud; the back is spotted with clay.

One is reminded of a scavenger who has been scooping up mud all day.

This condition is the more striking in that the insect comes from an absolutely dry soil.

We should expect to see it dusty; we find it muddy.
One more step, and the problem of the well is solved.

I exhume a larva which is working at its gallery of exit.