This fly is one and five-sixteenths inches long, and expands two and a half inches. The head and thorax are much as in the other species. The wings are very long and strong, and, as in the other species, are of a smoky brown color. The abdomen is short, pointed, concave from side to side on the tinder surface, while the grayish yellow hairs are abundant on the legs and whole under portion of the body. The color is a lighter yellow than in the other species. These insects are powerfully built, and if they become numerous, must prove a formidable enemy to the bees. Another insect very common and destructive in Georgia, though it closely resembles the two just described, is of a different genus. It is the _Laphria thoracica_ of Fabricius. In this genus the third vein is forked, and the third joint of the antenna is without the bristle, though it is elongated and tapering. The insect is black, with yellow hair covering the upper surface of the thorax. The abdomen is wholly black both above and below, though the legs have yellow hairs on the femurs and tibia. This insect belongs to the same family as the others, and has the same habits. It is found North as well as South. HONEY-COMB CORAL. A very common fossil found in many parts of the Eastern and Northern United States, is, from its appearance, often called petrified honey-comb. We have many such specimens in our museum. In some cases the cells are hardly larger than a pin-head; in others a quarter of an inch in diameter. [Illustration: Fig. 132.] These (Fig. 132) are not fossil honey-comb as many are led to believe, though the resemblance is so striking that no wonder that the public generally are deceived. These specimens are fossil coral, which the paleontologist places in the genus Favosites; favosus being a common species in our State. They are very abundant in the lime rock in northern Michigan, and are very properly denominated honey-stone coral. The animals of which these were once the skeletons, so to speak, are not insects at all, though often called so by men of considerable information. It would be no greater blunder to call an oyster or a clam an insect. The species of the genus Favosites first appeared in the Upper Silurian rocks, culminated in the Devonian, and disappeared in the early Carboniferous. No insects appeared till the Devonian age, and no Hymenoptera--bees, wasps, etc.--till after the Carboniferous. So the old-time Favosites reared its limestone columns and helped to build islands and continents untold ages--millions upon millions of years--before any flower bloomed, or any bee sipped the precious nectar. In some specimens of this honey-stone coral (Fig. 133), there are to be seen banks of cells, much resembling the paper cells of some of our wasps. This might be called wasp-stone coral, except that both styles were wrought by the self-same animals. [Illustration: Fig. 133.] GENERAL INDEX. PAGE