. 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. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 351 Thalexsa lunator, a slender, brown and yellow, wasp-like Ichneumon with a long delicate ovipositor. Pupa.—Formed in burrow within a cocoon made of silk and chips. (Gall-flies) The injury done by Cynipids to economic plants is not serious, being confined mainly to oaks and roses. (Consult Felt's Key to American Insect Galls). Eggs are laid in the leaves, ste
. 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. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 351 Thalexsa lunator, a slender, brown and yellow, wasp-like Ichneumon with a long delicate ovipositor. Pupa.—Formed in burrow within a cocoon made of silk and chips. (Gall-flies) The injury done by Cynipids to economic plants is not serious, being confined mainly to oaks and roses. (Consult Felt's Key to American Insect Galls). Eggs are laid in the leaves, stems and roots, and soon gall-like en- largements are formed as a result of the stimulus of the larvae. The galls are closed and are very varied in shape. The Mossy Rose-gall on Sweet- brier, produced by Rhodites rosce Linn., is many-celled and consists of a number of hard kernels embracing the stem, covered with reddish-green mossy filaments. The Pithy Blackberry-gall, pro- duced by Diastrophus turgidus on blackberry canes consists of an elon- gated, many-celled, ridged, woody, reddish-brown gall. Pithy Blackberry-gall Fly {Dias- trophus turgidus Bass.). Adult.—Black, 1^2 inch long; feet antennae red; four wings, transparent and almost without veins. Early summer. Larva.—White, 3-lo ii^ch long, mouth-parts and spiracles reddish; hibernates in cells of gall. Pupa.—Formed in spring. Control.—Cut out and burn infested canes during the winter. Several species infest oaks, viz., Amphibolips spp., Holcaspis spp., Andricus spp., and Cynips spp., each producing its characteristic gall. PROCTOTRYPIDiE (PROCTOTRYPIDS) The members of this family, or rather the group Proctotrypoidea, are the smallest of insect parasites. They are usually black and without. Fig. 234.—Pigeon tremex {Tremex columhd): A, adult; B, larva (with parasitic larva of Thalessa attached). Natural size. (After Riley.) and. Please note that these images are extracted from scanned page images that may have bee
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
