. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 300 ECONOMIC ENTOMOLOGY BUPRESTID^ (METALLIC WOOD BORERS) Common Genera (after Blatchley): A. Hind coxal plates dilated near base. B. Prosternal spine obtusely angulated behind the coxae; epimera of metathorax triangular, uncovered. C. Mentum entirely horn-like, elytra without yellow markings.ââ Dicer ca. CC. Mentum membranous in front; elytra usually marked yellow.â Buprestis. BB. Prosternal spine acutely angulated be
. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 300 ECONOMIC ENTOMOLOGY BUPRESTID^ (METALLIC WOOD BORERS) Common Genera (after Blatchley): A. Hind coxal plates dilated near base. B. Prosternal spine obtusely angulated behind the coxae; epimera of metathorax triangular, uncovered. C. Mentum entirely horn-like, elytra without yellow markings.ââ Dicer ca. CC. Mentum membranous in front; elytra usually marked yellow.â Buprestis. BB. Prosternal spine acutely angulated behind the coxae; epimera of metathorax partly covered by abdomen. Clypeus contracted, scutel- lum large, first joint of hind tarsi elongate.âChrysobothris. AA. Hind coxal plates scarcely dilated near base. B. Hind tarsi with first joint as long as the three following; antennas free; thorax truncate at base; clypeus not narrowed.âAgriliis. Flat-headed Apple-tree Borer {Chrysobothris femoraia Fab.).â(Con- sult Bull. 437, U. S. Dep. Agric.) This borer attacks shade and forest trees as well as orchard trees, and is of common occurrence. It attacks un- healthy trees by preference (Fig. 197). Adult.âA dark flattened metallic brown buprestid beetle, 1^ inch long; wing-covers par- allel, thin, tapering to a point behind, under surface greenish- blue; under surface of body coppery-bronze. June. Eggs.âYellowish, ribbed, }^q inch long; deposited in crevices of the bark, often several together. Larva.â^Light yellow, i inch long when full grown; thorax broad and flattened; abdomen flattened and often curved. Head small and concealed by thorax; tunnels formed immediately under the bark, sometimes girdling the trees. Matures in a year and winters as a full grown larva. Pupa.âYellowish; duration about 3 weeks, in spring. Parasites.âCertain braconids, ichneumonids and Fig. 197.âPlat-headed apple-tree borer (Chrysobothris femorata): a, larva; b, beetle; d, pupa. (After Chit
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
