Of course insects of the genus Bombus--our common bumble-bees--belong to this family. Here the tongue is very long, the bee large, the sting curved, with the barbs very short and few. Only the queen survives the winter. In spring she forms her nest under some sod or board, hollowing out a basin in the earth, and after storing a mass of bee-bread--probably a mixture of honey and pollen--she deposits several eggs in the mass. The larvæ so soon as hatched out, eat out thimble-shaped spaces, which in time become even larger, and not unlike in form the queen-cells of our hive-bees. When the bees issue from these cells the same are strengthened by wax. Later in the season these coarse wax cells become very numerous. Some may be made as cells and not termed as above. The wax is dark, and doubtless contains much pollen, as do the cappings and queen-cells of the honey-bees. At first the bees are all workers, later queens appear, and still later males. All, or nearly all, entomologists speak of two sizes of queen bumble-bees, the large and the small. The small appear early in the season, and the large late. A student of our College, Mr. N. P. Graham, who last year had a colony of bumble-bees in his room the whole season, thinks this an error. He believes that the individuals of the Bombus nest exactly correspond with those of the Apis. The queens, like those of bees, are smaller before mating and active laying. May not this be another case like that of the two kinds of worker-bees which deceived even Huber, an error consequent upon lack of careful and prolonged observation? In Xylocopa or the carpenter-bees, which much resemble the bumble-bees, we have a fine example of a boring insect. With its strong mandibles or jaws it cuts long tunnels, often one or two feet long in the hardest wood. These burrows are divided by chip partitions into cells, and in each cell is left the bee-bread and an egg. The mason-bee--well named--constructs cells of earth and gravel, which by aid of its spittle it has power to cement, so that they are harder than brick.