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My district possesses five: A. Florentinum, LATR., A. diadema, LATR., A. manicatum, LATR., A. cingulatum, LATR., A. scapulare, LATR. None of them creates the refuge in which the cotton goods are manufactured. Like the Osmiae and the Leaf-cutters, they are homeless vagrants, adopting, each to her own taste, such shelter as the work of others affords.
The Mason-bee of the Sheds, on the other hand, supplies free lodgings to two species of Osmiae, Osmia tricornis, LATR., and Osmia Latreillii, SPIN., both of whom are quite common. The Three-horned Osmia frequents by preference the habitations of the Bees that build their nests in populous colonies, such as the Chalicodoma of the Sheds and the Hairy-footed Anthophora.
They are the following: Anthidium septemdentatum, LATR., A. bellicosum, LEP., A. quadrilobum, LEP., and A. Latreillii, LEP. The first two make their nests in deserted Snail-shells; the other two shelter their groups of cells sometimes in the ground, sometimes under a large stone. We will first discuss the inhabitants of the Snail-shell.
Two Anthidia of my district, A. septemdentatum, LATR., and A. bellicosum, LEP., adopt as the home of their offspring the empty shells of different snails: Helix aspersa, H. algira, H. nemoralis, H. caespitum. The first-named, the Common Snail, is the most often used, under the stone-heaps and in the crevices of old walls. Both Anthidia colonize only the second whorl of the spiral.
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