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Updated: May 5, 2025
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.
That is the sum-total of the building done. For this plasterer's rather than mason's work, the Horned and the Three-horned Osmia employ soft earth. This material is a sort of dried mud, which turns to pap on the addition of a drop of water.
I therefore thought out a scheme for making the Three-horned Osmia accept my study as her settlement and build her nests in glass tubes, through which I could easily watch the progress.
We know that the Three-horned Osmia prefers to haunt the habitations of the Bees who nidify in populous colonies, such as the Mason-bee of the Sheds and the Hairy-footed Anthophora, in whose nests I have noted similar facts. Thus the sex of the egg is optional.
Let us in the first place consult the old nests of the Mason-bee of the Shrubs. I have said that these mortar spheroids, pierced all over with little cylindrical cavities, are adopted pretty eagerly by the Three-horned Osmia, who colonizes them before my eyes with females in the deep cells and males in the shallow cells. That is how things go when the old nest remains in its natural state.
The building of this preliminary party-wall, with a narrow, round dog-hole, for a chamber to which the victuals will not be brought until later is not restricted to the Three-horned Osmia; it is also frequently found in the case of the Horned Osmia and of Latreille's Osmia.
He had to force himself to look, then gave a shuddering breath of relief. It was a zaragoat, a three-horned domesticated ungulate. "Oh-Oh! Some squatter's milk supply finished." The commentator laughed. "Not the first one tonight either. Attorney General former Chief Prosecutor O'Brien's going to have quite a few suits against the administration to defend as a result of this business."
Latreille's Osmia is nearly always found with the Three-horned Osmia at the Chalicodoma's. The real builder of the city and the exploiter of the labour of others work together, at the same period, form a common swarm and live in perfect harmony, each Bee of the two species attending to her business in peace. They share and share alike, as though by tacit agreement.
Two species have come hurrying up to take part in the joys of the almond-tree: first, the Horned Osmia, clad in black velvet on the head and breast and in red velvet on the abdomen; and, a little later, the Three-horned Osmia, whose livery must be red and red only.
These cocoons are oval-shaped and may be regarded as ellipsoids formed by a revolution around the major axis. in which 2a is the major axis and 2b the minor axis. Now, the average dimensions of the cocoons of the Three-horned Osmia are as follows: 2a = 13 mm. 2a = 9 mm.
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