Sometimes also, but seldom, it copies the Chalicodoma of the Walls and builds upon an ordinary pebble.

(Or Mason-bee .-- Translator's Note.) Eumenes pomiformis is much more common and is comparatively indifferent to the nature of the foundation whereon she erects her cells.

She builds on walls, on isolated stones, on the wood of the inner surface of half-closed shutters; or else she adopts an aerial base, the slender twig of a shrub, the withered sprig of a plant of some sort.

Any form of support serves her purpose.

Nor does she trouble about shelter.