The Chironomidae, or Midges, of Illinois; With Particular Reference to the Species Occurring in the Illinois River

The Chironomidae, or Midges, of Illinois; With Particular Reference to the Species Occurring in the Illinois River

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...than the basal portion; slender, tapering species, the body segments slightly flattened and well defined...........Cric0topus varipes. Central labial tooth and all except the first lateral truncated api-cally, first lateral very short, and acute at apex (Pl. XXIX, Fig. 5); mandibles without distinct teeth (Pl. XXX, Fig. 3); antenna as in Figure 6, Plate XXX.........Chiron0mus sp. B (p. 529). Labium not as above.......................................17 Mandibles with two poorly defined teeth (Pl. XXX, Fig. 1), 3 very large labial teeth, the others short (Pl. XXIX, Fig. 15)...........................................Genus incertus A (p. 532). Mandibles with well-developed teeth; labium otherwise than above...................................................18 Central labial tooth very broad, at least twice as broad as first lat-eral tooth, central portion of labium paler than lateral por-tions...................................................19 Central labial tooth not twice as broad as first lateral; or the cen-tral portion of labium generally as dark as the lateral portions.21 Central labial tooth regularly rounded, slightly more than twice as broad as second tooth, which is pale and rounded (Pl. XXIX, Fig. 21).........................Orth0cladius sp. B (p. 531). Central pale portion of labium consisting of a very slightly rounded and very broad tooth without indications of indentations though not smooth apically......................................20 Sides of labium sloping very decidedly backward (Pl. XXIX, Fig. 17).............................Orth0cladius sp. E (p. 532). Sides of labium sloping but little backward (Pl. XXIX, Fig. 13)..................................Orth0cladius sp. A (p. 531). Central tooth of labium very much longer...show more

Product details

  • Paperback | 110 pages
  • 189 x 246 x 6mm | 213g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236849124
  • 9781236849120