Illinois Biological Monographs Volume 3, No. 2

Illinois Biological Monographs Volume 3, No. 2

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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. 1916 edition. Excerpt: ...with the invaginations of the posterior arms of the tentorium. Structurally they are composed of small triangular cardines (ca), long stipites (st), five-segmented palpi (mx.pl), needle-like galeae (g), and short laciniae (la). The cardines and stipites differ from those of generalized insects in that they are embedded in the mesal membranous area ventrad of the occipital foramen. The palpi, galeae, and laciniae are free appendages. The proximal ends of the cardines are adjacent to the invaginations of the posterior arms of the tentorium. The structure and position of the various parts of the hypothetical type have been traced thruout the order. The species in which the ptilinum is wanting are considered first. The cardines (ca) are small distinct triangular selerites in Trichocera (Fig. 260), Rhyphus (Fig. 261), Dixa (Fig. 262), and the female of Tabanus (Fig. 259). In these genera they are adjacent to the invaginations of the posterior arms of the tentorium. The cardines of Simulium (Fig. 258), in both males and females, differ from those of the above genera in that they are large and occupy nearly all of the membranous area between the postgenae dorsad of the stipites. Their margins are also somewhat indistinct. No other forms figured have distinct sclerites that are homologous with the cardines of the hypothetical type. The maxillae of Rhabdophaga (Fig. 268), Bibiocephala (Fig. 269), and Chironomus (Fig. 270) connect with the invaginations of the posterior arms by means of narrow chitinized processes which arise from the stipites proper. Undoubtedly these pieces are reduced cardines which have lost the suture that separates them from the stipites. The presence of this suture is suggested by the suture-like depression in the male of...show more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236563557
  • 9781236563552