. A manual of dangerous insects likely to be introduced in the United States through importations. d NewZealand. SoRAUER, P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 435. OAK. (Quercus spp. Family Cupuliferse.) Valuable timber trees of the northern hemisphere. The bark of certain speciesyields cork, while of other species it is valuable for medicinal or tanning purposes. A. BETTER KNOWN OAK INSECTS LIKELY TO BE IMPORTED. H<AgrUus vlridis Linnaeus. (Flat-Headed Wood Borer. Buprestidae; Coleoptera.) nosts: Oak, beech, alder, aspen, linden, birch, rose, grape, maple,
. A manual of dangerous insects likely to be introduced in the United States through importations. d NewZealand. SoRAUER, P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 435. OAK. (Quercus spp. Family Cupuliferse.) Valuable timber trees of the northern hemisphere. The bark of certain speciesyields cork, while of other species it is valuable for medicinal or tanning purposes. A. BETTER KNOWN OAK INSECTS LIKELY TO BE IMPORTED. H<AgrUus vlridis Linnaeus. (Flat-Headed Wood Borer. Buprestidae; Coleoptera.) nosts: Oak, beech, alder, aspen, linden, birch, rose, grape, maple, : Bores in stems and branches of trees. OAK INSECTS. 151 Description and biology: Beetle 5-8 mm. long, of variable color (olive green, bluegreen, blue, coppery, etc.), undersides black. Prothorax much broader than long,with median impression. Larva with first thoracic segment strongly broadened, bodywhite. A generation requires two years. Distribution: Europe (Austria, Germany). Introduced into eastern United Statesin , Richard. Der Forstschutz, 1900, vol. 2, pp. 7, 8, figs. 2, Fig. 76.—Great oak-borer (Cerambyx cerdo): Adult and larva. (Xiisslin.) Cerambyx cerdo Linnaeus. (Great Oak Borer. Cerambycidae; Coleoptera.) Hosts: Oak, cork oak, ash, : Bores in wood. (See text fig. 76.)Distribution: Europe, Sudan, , Otto: Leitfaden der Forstinsektenkunde, 2d ed., 1913, pp. 145-148, figs. 115, , P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, pp. 495-496. Haltica quercetorum Foudr. (Oak Flea Beetle. Chrysomelidse. Coleoptera.) Hosts: Oak, hazel, willow, birch, tea rose, beech, alder. 152 A MANUAL OF DANGEEOUS INSECTS. Injury: Feed on foliage and buds in adult and larval : Europe (Russia, Germany). SoRAUER, P. Handbucli der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, p. 523. Cnethocampa processiona Linnaeus. (Oak Procession Moth. Cnethocampidse; Lepidoptera.) Host: Oak. Injury: Defoliator; serious. Descr
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