. Eastern forest insects. Forest insects. Buprestid larvae are distinguished primarily by well-developed ambulatory plates on the upper and lower surfaces of the first segment behind the head, by the presence of a central line, groove, or V on the upper plate, and by the absence of legs. The larvae of all bark and wood boring species are typically "flatheaded," a condition caused by the greatly enlarged first and sometimes sec- ond and third thoracic segments (fig. 46). Leaf-mining larvae are flattened, rather oval-shaped, deeply notched at the sides, and gradually taper toward the r
. Eastern forest insects. Forest insects. Buprestid larvae are distinguished primarily by well-developed ambulatory plates on the upper and lower surfaces of the first segment behind the head, by the presence of a central line, groove, or V on the upper plate, and by the absence of legs. The larvae of all bark and wood boring species are typically "flatheaded," a condition caused by the greatly enlarged first and sometimes sec- ond and third thoracic segments (fig. 46). Leaf-mining larvae are flattened, rather oval-shaped, deeply notched at the sides, and gradually taper toward the rear. The true head in all larvae is comparatively small, more or less retracted into the first thoracic segment, and scarcely COURTESY OF DUKE UNIV. SCH. OF FOREST. Figure 46.—Typical larva of a flatheaded borer. Bark- and wood-boring buprestids deposit their eggs singly or in masses either on the bark, in crevices in the bark or wood, or under the bark at the edges of wounds. Weakened, injured, dead, or dying trees and stumps are usually attacked. Occasionally, green trees are also infested. The larvae feed either under the bark, in the sapwood or heartwood, or in two or more of these places. Their mines are winding and usually oval in cross section. Eventually, they terminate in elongated pupal cells which are connected to the surface by short, oval exit holes. A characteristic of the mines is that they usually are packed tightly with layers of sawdust-like borings and pellets and their walls are scarred with fine, transverse lines. Many wood-boring species spend the winter as adults in pupal cells. A few overwinter in the larval stage. The life cycle usually requires 1 or 2 years, but in certain species it takes many years. Key to the Adults of the Eastern Genera of Buprestidae 1. Hind coxal plates scarcely widened internally 2 Hind coxal plates distinctly widened internally, front margin straight, hind margin oblique 10 2. Prothorax truncate at base 3 Prothorax
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
