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On the other hand, we can quite easily, without arming the eye with a lens, perceive the mouth-apparatus and particularly the mandibles of either a honey-eater, such as an Osmia, Chalicodoma or Megachile, or a game-eater, such as a Scolia, Ammophila or Bembex. All these possess stout pincers, capable of gripping, grinding and tearing.
In the thicket chosen as a pinking-establishment, the Megachile sees but one thing: leaves useful for her work. The Shrike, with his passion for plants with long, woolly sprigs, knows where to find nicely-wadded substitutes when his favourite growth, the cotton-rose, is lacking; the Megachile has much wider resources: indifferent to the plant itself, she looks only into the foliage.
Lastly, to complete the enumeration of the Bees known to me as making their homes in the Mason's cupolas, I must add Megachile apicalis, who piles in each cell a half-dozen or more honey-pots constructed with disks cut from the leaves of the wild rose, and an Anthidium whose species I cannot state, having seen nothing of her but her white cotton sacks.
Let one of the Odyneri who make their homes in a road-side bank mistake the door and enter her neighbour's house: she would have a bad time of it! Let a Megachile, returning with her leafy disk in her legs, go into the wrong basement: she would be very soon dislodged! So with the others: each has her own home, which none of the others has the right to enter.
A certain number of her sisters, belonging to species already more skilful and better supplied with utensils, such as the well-clad Colletes, or the marvellous cutter of rose-leaves, the Megachile Centuncularis, live in an isolation no less profound; and if by chance some creature attach itself to them, and share their dwelling, it will either be an enemy, or, more often, a parasite.
Fed upon the larva of the Three-horned Osmia or of the Blue Osmia, Anthrax sinuata, whether of handsome proportions or a dwarf, is still Anthrax sinuata; fed upon the allowance of the Anthidium of the empty Snail-shells, the Anthidium of the brambles, the Megachile or doubtless many others, the Burnt Zonitis is still the Burnt Zonitis.
The implement of the Megachile, the rose-fly, is by no means appropriate to its industry; "yet the perfectly circular fragments of leaves have the precise perfection of form that a punch would give."
A hymenopterous relative of the Bees, the Megachile, cuts out in rose-leaves fragments of appropriate form which it bears away to a small hole in a tree, an abandoned mouse nest or some similar cavity. There it rolls them, works them up, and arranges them with much art, so as to manufacture what resemble thimbles, which it fills with honey and in which it lays.
Instead of a general scabbard of leaves, afterwards subdivided into compartments by transverse partitions, the Megachile constructs a string of separate wallets, each of which is finished before the next is begun. A structure of this sort needs a sheath to keep the pieces in place while giving them the proper shape.
When the deserted cabin, owing to its position, remains wholesome and there is no sign of any running from its walls, no brown stuff smelling of the tan-yard, it is soon visited by the Silky Megachile, who finds in it the most sumptuous of the apartments inhabited by the Leaf-cutters.
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