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.
This is also known as the Fetid Rove Beetle (Ocypus olens). It has a long, narrow, deep-black body, and preys upon insects with great energy, and will soon tear an earwig to pieces. The larvae also feed upon insect pests. During the month of May the insect is in the pupa or chrysalis state, but is very frequently met with in autumn. Fig. 155 shows the full-grown beetle and the larval stage, and the enlarged head shows the powerful jaws.
The Violet Ground Beetle (fig. 156) is known as Carabus violaceus. It is an insect-eating beetle often found under stones and clods of earth, and is very often killed by those who are ignorant of its garden value. It has a violet-black body and rather coarsely granulated wing cases, and should be readily recognized by all cultivators as a friend.
The Tiger Beetle (Cicindela sylvatica), shown in fig. 157, is a black beetle with a violet under surface, and is very active in search of prey. The common Tiger Beetle (C. campestris) inhabits banks and sandy commons. It is about \ in. long, and is green in colour with six white spots on each wing case, including the round one on the disk. The larva has a large head and a hump on its back near the tail, bearing two spines, by means of which it anchors itself in its burrow, waiting for its prey. Other kinds of insect-eating beetles are those known under the names of Pterostichus madidus and P. cupreus, often called Sun Beetles, owing to the activity they display in running to and fro in the sunshine in search of food. The last-named (P. cupreus) is about 1/2 in. long, with a green, bronzy, brassy or bluish-black body, the under surface being black.
Fig. 157. - Tiger Beetle (Cicindela sylvatica).
1. Crepuscule. 2. Coquelicot. 3. Tapis Blanc. (Three-fourths natural size)