Applied Entomology; An Introductory Text-Book of Insects in Their Relations to Man

Applied Entomology; An Introductory Text-Book of Insects in Their Relations to Man

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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. 1921 edition. Excerpt: ...on their backs and in some way are able to remain under water without coming up for air for a much longer time than the backswimmers. Like the latter group they often leave the water and fly at night and are frequently attracted to lights. Family Nepidae.--The water-scorpions as these insects are called, live in fresh-water ponds and pools. Two types of form are included, Fio. 176. Fio. 175.--Water-scorpion (Ranatra americana Montl.) about natural size. (Original.) Fia. 176.--Giant Water-bug (Lethocerus amcricanue Leidy), natural size. (Original.) one having a long, slender body and long legs (Fig. 175), the front pair of which, unusually long, are constructed for grasping their prey which consists of small insects. In the other type the body is short, rather broad, and flat. In both a long tube consisting of two pieces which can be pressed together to form the tube, joins the hinder end of the body and while the insect is an inch under water in some cases, this tube is pointed upward until its tip is out of water and through it the insect obtains air. The slender forms lying quiet on the bottom of pools resemble dead twigs and thus obtain the concealment needed to enable them to get within reach of their food. Family Belostomidae.--These insects are generally termed the giant water-bugs. Some of them are the largest members of the Hemiptera, being two, three or more inches long, broad, flat and brown in color (Fig. 176). They live in fresh water and feed on insects and even small fish and are thus sometimes injurious in the production of food fishes. They fly by night and are frequently attracted to electric lights, which has led to the larger species being sometimes called "electric-light bugs." In some of the smaller species ( more

Product details

  • Paperback | 136 pages
  • 189 x 246 x 7mm | 254g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236509978
  • 9781236509970