. Principles of economic zoo?logy. Zoology, Economic. COLEOPTERA 151 Comstock says they remain still until within our sight, but out of reach, and then " like a flash they fly up and away, alighting several rods ahead of us," with eyes toward us. The ugly larva; live in vertical burrows about a foot deep on beaten paths or in the sand. The larva, with its dirt- colored head which is bent at right angles to its lighter colored body, plugs the entrance to its burrou-, and with its wide-open jaws forms a living trap tor passing insects. On the fifth abdominal segment there is a hump bea
. Principles of economic zoo?logy. Zoology, Economic. COLEOPTERA 151 Comstock says they remain still until within our sight, but out of reach, and then " like a flash they fly up and away, alighting several rods ahead of us," with eyes toward us. The ugly larva; live in vertical burrows about a foot deep on beaten paths or in the sand. The larva, with its dirt- colored head which is bent at right angles to its lighter colored body, plugs the entrance to its burrou-, and with its wide-open jaws forms a living trap tor passing insects. On the fifth abdominal segment there is a hump bearing two hooks curved forward, by which the larva holds fast, thus pre- venting large prey from dragging it out of its burrow. The ground beetles (Fig. 122} (Carab'idce) are probably the most im- portant family of predaceous insects, though a few species are vegetable feeders. They are usually dark colored and nocturnal, but some are large and brilliantly colored, and the wing covers are generally " ornamented with longitudinal ridges and rows of ; They hide in daytime under stones and logs. There are about twelve hundred species in North. Fig. 121.—June beetles: 1, Pupa; 2, larva; 3, 4, adult. (Riley, Report of State Entomologist of Missouri.) America. The larvae of most of them are long flattened grubs, with body of uniform breadth throughout, protected on top by horny plates, ending in a pair of conical bristly appendages. Usually they bury themselves just beneath the surface and feed upon insects which enter the ground to pupate. They destroy large numbers of leaf-feeding beetles or their larvae. They pupate in small round cells in the soil, from which the adults push their way out. The caterpillar hunter (Caloso'ma scrvta'tor) is a familiar example of the ground beetles (Fig. 122). Its wing covers or elytra are bright green or violet, margined with reddish. It is found on trees at dusk. It is known to climb trees and make raids upon the hairy tent cat
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