220. Calosoma calidum and Larva.
The larvæ are found in much the same situations as the mature beetles. They are, elongate, oblong, and rather broad, the terminal ring of the body being armed with two horny hooks, and having a single fleshy leg beneath; and are usually black in color. The larva of Calosoma (C. calidum, Fig. 220; a, the beetle; and Fig. 219, C. scrutator) ascends trees to feed on caterpillars, such as the Canker worm. When about to transform to the pupa state, it forms a rude cocoon in the earth. The beetle lies in wait for its prey in shallow pits excavated in pastures. We once saw it fiercely attack a May beetle (Lachnosterna fusca) nearly twice its size; it tore open the hard sides of its clumsy and helpless victim with tiger-like ferocity. Carabus (Fig. 221, C. serratus Say, and pupa of Carabus auronitens of Europe, after Westwood) is a closely allied form, with very similar habits.
222. Brachinus. 223. Casnonia.
226. Carabid Larva.
221. Carabus and Pupa.
224. Pangus. 225. Agonum.