A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . long as the body, and composed of upward of 55 joints ; they also occur in the Pan- orpidjB (Fig. 177). In the dragon-flies the cerci are large, but not articulated, and serve as claspers or are leaf -like1 (Fig. 180). In a few Coleoptera, as the palm-weevil (Rhynchophorus phoenicis), Cerambyx, Drilus, etc., the so-called ovi- positor ends in a hairy, 1 -jointed, palpi- form cercus. Short 25-jo
A text-book of entomology, including the anatomy, physiology, embryology and metamorphoses of insects, for use in agricultural and technical schools and colleges as well as by the working entomologist . long as the body, and composed of upward of 55 joints ; they also occur in the Pan- orpidjB (Fig. 177). In the dragon-flies the cerci are large, but not articulated, and serve as claspers or are leaf -like1 (Fig. 180). In a few Coleoptera, as the palm-weevil (Rhynchophorus phoenicis), Cerambyx, Drilus, etc., the so-called ovi- positor ends in a hairy, 1 -jointed, palpi- form cercus. Short 25-jointed cercopoda are present in Termi- tidae, and 2- jointed ones in anal cerci are present in the Orthop- tera and, 1 •,,. Wiieil multl- articulate, function as abdominal antennae. Theyare longest in the Mantidse (Fig. 182);they also occur in the larva of the saw-fly, Lyda (Fig. 183). Dr. A. Dohrn hasstated that the cerci of Gryllotalpa aretrue sensory organs, and we have calledthose of the cock-roach abdominalantennae, havingdetected aboutninety sacs onthe upper side of each joint of the stylets, which are, supposed to be olfactory in nature, and FIG. ISO. — End of abdomen of J.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
