. Eastern forest insects . F-519911 Figure 38.—Adult of the southern lyctus beetle, Lyctus pldnicollis. Full-grown larvae are yellowish-white and about 3 to 5 mm. long. Usually there is only one generation per year, but under certain conditions, a generation may be completed in 3 to 4 months or less. Heaviest emergence and egg laying usually occur during late winter or early spring. Winter is spent in the larval stage (139, 795). Lyctus linearis Goeze, probably an introduced species, occurs throughout the United States. In the eastern half of the country it is commonly encountered in commercia
. Eastern forest insects . F-519911 Figure 38.—Adult of the southern lyctus beetle, Lyctus pldnicollis. Full-grown larvae are yellowish-white and about 3 to 5 mm. long. Usually there is only one generation per year, but under certain conditions, a generation may be completed in 3 to 4 months or less. Heaviest emergence and egg laying usually occur during late winter or early spring. Winter is spent in the larval stage (139, 795). Lyctus linearis Goeze, probably an introduced species, occurs throughout the United States. In the eastern half of the country it is commonly encountered in commercial hardwood products, especially in seasoned hickory, oak, ash, and walnut. It is often quite destructive. The adult is brown or reddish-brown and about to 5 mm. long. The pronotum is almost square; the elytra are wider than the pronotum and are almost three times as long as wide. The interspace is composed of a single row of large, ovoid punctations, separated by single rows of fine hairs on the carinu- lae. There is a fringe of fine hairs on the fifth sternite in both sexes. Other species of Lyctus frequently encountered in eastern United States include L. cavicollis LeC.; the western lyctus beetle, L. opaculus LeC; and L. brunneus (Stephens), the Old World lyctus beetle. The following distinguishing characteristics should be helpful in identifying them: (1) L. cavicollis—elytral striae composed of two rows of punctations. A triangular patch of hairs on each side of median line of apical portion of fifth sternite of female. (2) Western lyctus beetle—two or more rows of puncta- tions separated by carinulae bearing fine hairs in the elytral inter- space. The fifth sternite of the male rounded, with a broad fringe of short hairs on the apical margin. (3) Old World lyctus beetle— all carinulae of the elytra bear single rows of fine sparse hair with longitudinal rows of hairs between interspaces. The fifth abdominal sternite of the female bears a "pencil" of h
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
