Report of the United States Entomological Commission for the Years

Report of the United States Entomological Commission for the Years

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 edition. Excerpt: shown by its habits. The flies hover iu the spring and autumn over the wheat-fields in countless numbers, especially at morning and evening, avoiding the direct heat of the sun. PARASITES OP THE HESSIAN FLY. How useful, nay indispensable, parasitic insects may prove in keeping. the noxious ones within due limits is well illustrated by the case of this fly, for whenever it suddenly disappears from a given locality, this is usually due to the attacks of its parasites, and especially one Chaleid fly, the Semiotellus Romoporus destructor, first described by Say. This is a hymenopterous insect, having four wings and belonging to the same order of insects as the saw-flies, four-winged gall-flies(Gynips), the larger ichneumons, and the wasps and bees. It is a member of the family Chalcididw. As stated in our Guide to the Study of Insects, this is a group of great extent, the species being of small size; they are often of shiny colors, as the name of the principal genus implies, being either bronze or metallic. They also have elbowed antenna) with from six to fourteen joints, and the wings are often deficient in veins. The abdomen is usually smaller, and composed ordinarily of seven rings in the male, and of six in the female, the latter often having a short but visible ovipositor, a horny tube consisting of three pairs of stout bristles closely united and forming a quite solid tube. Some species are wingless. There are 1,200 species of the family known in Europe, and there are, in all probability, at least 1,000 in the United States. Few of them are over a line in length. Semiotellus destructor, male. (Plate IV, Fig. t, much enlarged.) The head is transversely oblong, or rather cubical, being rather wider than long, and slightly broader than the...
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Product details

  • Paperback | 222 pages
  • 189 x 246 x 12mm | 404g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236582586
  • 9781236582584