. 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 BUPRESTIDiE (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, eh'tra without yellow markings.— Dicerca. CC. Mentum membranous in front; elytra usually marked yellow.— Buprestis. BB. Prosternal spine acutely angulated beh
. 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 BUPRESTIDiE (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, eh'tra without yellow markings.— Dicerca. CC. Mentum membranous in front; elytra usually marked yellow.— 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.—Chrysobothris. AA. Hind coxal plates scarcely dilated near base. B. Hind tarsi with first joint as long as the three following; antennae free; thorax truncate at base; clypeus not narrowed.—Agrilus. Flat-headed Apple-tree Borer {Chrysobothris femorata Fab.).—(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). A dull.—A dark flattened metallic brown buprestid beetle, }--2 inch long; wing-covers par- allel, thin, tapering to a point behind, under surface greenish- blue; under surface of body coppery-bronze. June. Eggs.—Yellowish, ribbed, I50 inch long; deposited in crevices of the bark, often several together. Larva.—^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.—Yellowish; duration about 3 weeks, in spring. Parasites.—Certain braconids, ichneunionids and Fig. —Flat-headed apple-tree borer {Chrysobothris femorata): a, larva; b, beetle; d, pupa
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
