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Updated: June 16, 2025
Facts clearly stated are preferable to the dry minutiae of nomenclature. Let me content myself with giving a brief description of the culprit. She is a Dipteron, or Fly, five millimetres long. Corselet, pearl-grey, with five rows of fine black dots, which are the roots of stiff bristles pointing backwards. Greyish belly, pale below. Black legs. She abounds in the colony under observation.
The spring itself I had fashioned originally from a broad staybusk Emma had given me, but, when I came to test it; it proved too weak; so I made another from a saw-blade only six millimetres across, after I had first filed off the teeth. This new spring, however, was too strong; I had to manage as best I could by winding it only half-way up, and then, when it ran down, half-way up again.
It is a roomy niche, shaped like a flattened ellipsoid, the length of which reaches some eighty to a hundred millimetres. The two axes of the cross-section vary: the horizontal measures twenty-five to thirty millimetres; the vertical measures only fifteen.
The lime of the road, mixed with saliva, yields a harder cement than red clay would do. At any rate, the Chalicodoma's nest is more or less white because of the source of its materials. When a red speck, a few millimetres wide, appears on this pale background, it is a sure sign that a Stelis has been that way.
This is achieved in two ways: the ground is covered with parallel close-set scratches, not running continuously throughout the larger areas of the ground, but grouped in sets of parallel lines some few millimetres in length, the various sets meeting at angles of all degrees; the hard surface of the bamboo is wholly scraped away from the ground areas to a depth of about half a millimetre.
The wall has the same polish, the same chalky whiteness as the general passage. But the Anthophora does not limit herself to digging oval niches: to make her work more solid, she pours over the walls of the chamber a salivary liquid which not only whitens and varnishes but also penetrates to a depth of some millimetres into the sandy earth, which it turns into a hard cement.
Next comes the pseudochrysalis, horny, currant-red, cylindrical, cone-shaped at both ends, slightly convex on the dorsal surface and concave on the ventral surface. It is covered with delicate, prominent spots, sprinkled very close together; it takes a lens to show them. It is 1 centimetre long and 4 millimetres wide.
The floor of this apartment calls for no labour: it is supplied direct by the bare stone. Having chosen the site, the builder erects a circular fence about three millimetres thick. The insect selects its stone-quarry in some well-trodden path, on some neighbouring road, at the driest, hardest spots.
The cubit of 525 millimetres was the base of the whole system. We shall not here attempt to explain how the other measures itinerary, agrarian, of capacity, of weight were derived from the cubit; to call attention to the traces left in our nomenclature by the duodecimal or sexagesimal system of the Babylonians, even after the complete triumph of the decimal system, is sufficient for our purposes.
The needle is passed for a few millimetres along the vein, and the solution is then slowly introduced; before withdrawing the needle some saline is run in to diminish the risk of thrombosis. The "914" preparations may be injected either into the subcutaneous tissue of the buttock or into the substance of the gluteus muscle.
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