This section is from the book "Commercial Gardening Vol1", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
There are over twenty species of these known in Britain, but two especially are very common in gardens, viz. Coccinella (or Adalia) bipunctata and C. septempunctata. The first-named (fig. 154, 7), is black with scarlet wing cases, and two conspicuous black spots; the second (C septempunctata) is larger (fig. 154, 9) and has seven black spots on the wing cases. Another species (0. dispar) is shown at 8, fig. 154. The larvae or maggots of these Ladybirds, shown at 3, fig. 154, are slate-coloured and yellowish, and remind one of miniature alligators in appearance. It is these larvae that feed largely on aphides, and thus help the gardener by suppressing them. The maggots and ladybirds therefore should never be destroyed in gardens, and all children should be instructed as to their value.
Fig. 154. - Ladybirds.
1, Eggs, natural size, on a leaf. 2, Egg magnified. 3, Larva, with the line 4 showing natural size. 5 and 6, Pupae. 7, Coccinella bipunctata. 8, C. dispar. 9, C. septempunctata.
Fig. 156. - Devil's Coach Horse, or Fetid Rove Beetle (Ocypus olens).
1, Larva. 2, Full-grown beetle on the wing. 3, Head enlarged, showing the powerful jaws.
Fig. 156. - Violet Ground Beetle (Carabus violaceus).