Aquatic Insects in the Adirondacks

Aquatic Insects in the Adirondacks

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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. 1901 edition. Excerpt: ...apart, and, not being good climbers of reeds, generally seek some broader supporting surface, such as the side of a stump, or a cluster of grass blades. The eggs are dropped by the female while flying alone, dips being made far out in open water, and widely distributed. Nymph. (Pl. 21, fig. 2) Measures in total length 27 mm; abdomen 17 mm; hind femur 8 mm; width of head 7.5 mm, of abdomen 8 to 12 mm, there being very great variation in this last measurement. Since this nymph has been figured and described by Cabot, it will suffice here to give a brief statement of the more distinguishing characteristics. Head a little narrowed behind the small eyes, which cover the anterolateral angles; there is a pair of low conic tubercles on the top of the head, these larger in younger nymphs, and sometimes even cultriform. The statement that the young nymphs of this species do not differ from the grown nymph in this respect is sometimes (but very rarely) true. Labium with four (less often five) lateral setae, and four larger mental setae each side, with one or two lesser ones near the median line. Thorax with broad sterna. Abdomen depressed, triquetral; dorsal hooks large, cultriform, in a very regular series, on segments 2-9; lateral spines on segments 8 and 9, those of the ninth segment surpassing the level of the tips of the appendages; superior appendage very nearly as long as the inferiors, laterals a little more than half as long as the inferiors. There are two indistinct and interrupted bands of brownish markings, extending from the hind angles of the head to the bases of the spines on the ninth abdominal segment, and there are darker rings on tibiae and femora, discoverable specially after molting. This species was seen but a few times at Saranac Inn, ..show more

Product details

  • Paperback | 88 pages
  • 189 x 246 x 5mm | 172g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236596803
  • 9781236596802