These are gayly colored flies, frequenting flowers, and sporting themselves in rapid motions. Some, like the Volucella, often mistaken for Bombi themselves, lay their eggs in the nests of Bombi and Vespae. Fig. 8, the larvae. Fig. 9, the plumose antennae of the fly. Figs. 2, 3, and 4, are those which deposit their eggs in the midst of the aphids. Fig. 1 represents the oddly-shaped larvae, without legs or eyes; they project their attenuated end, armed with a mouth and triple-darts, and seize upon an aphid, elevate, and suck its juices. A number will speedily rid a plant, strewing the ground with the carcasses of their victims. When ready to undergo their change, they attach themselves by means of a glutinous secretion; when the body contracts and hardens, the pupa is then formed within the skin of the larva. Fig. 5 is the antennae. Fig. 6, the mouth of the perfect insect.

Much has been written on this subject by men of science - enough to fill a volume - but this must suffice, as it has already become too lengthy. We have now considered the natural means provided. The artificial means to be employed for their destruction, consist in fumigation with sulphur and tobacco, for those in greenhouses, where a moist atmosphere is requisite. By bending over the ends of branches infested, and holding them a few minutes in warm soapsuds, is good. The brine from pickled pork, and the liquid remaining after making hard soap, applied to the roots of hardy plants infested, is good. Scrubbing trees with a stiff brush and a solution of potash in spring; scraping off the loose bark from fruit-trees, down to the ground, uncovering a portion of the roots, and filling the chinks with grafting cement; replacing with fresh earth; or melt equal parts of resin and fish-oil together, and apply it warm with a brush. Syringing with pure water will clear rose bushes from the A. rosea. To conclude, I would recommend the reading of, and considering, the 10th and 11th verses of the third chapter of Malachi.