Because all the species, both in the larva and the perfect state, feed exclusively on aphides, and never touch vegetable substances. The eggs are usually placed in a group of twenty or more upon a leaf, where aphides abound; and when the young are hatched, they find themselves in the midst of their prey. - J. Rennie.
This, as well as some species of Meloe, has been recommended as a remedy for the tooth-ache. - Blu~ menbach.