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 . e Hymenoptera, and we added thatwe deemed this to be the most essential zoo-logical character separating the Hymenoptera fromall other insects. (See Fig. 93, showing thegradual transfer and fusion of this segment withthe thorax.) In the saw-flies the fusion is incom-plete, as also in the Lepidoptera, while in theDiptera and all other orders the thorax consistsof but three segments. (See also pp
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 . e Hymenoptera, and we added thatwe deemed this to be the most essential zoo-logical character separating the Hymenoptera fromall other insects. (See Fig. 93, showing thegradual transfer and fusion of this segment withthe thorax.) In the saw-flies the fusion is incom-plete, as also in the Lepidoptera, while in theDiptera and all other orders the thorax consistsof but three segments. (See also pp. 90-92.) The cercopoda.—We have applied thisname to the pair of anal cerci appendedto the tenth abdominal segment, and whichare generally regarded as true abdominallegs. As is now well known, the embryosof insects of different orders have numeroustemporary pairs of abdominal appendageswhich arise in the same manner, have thesame embryonic structure, and are placed ina position homologous with those of thethorax. In the embryo of (Ecanthus rudi-mentary legs appear, as shown by Ayers,on the first to tenth abdominal segment,FIG. 179. — Abdomen of jfa- the last or tenth pair becoming the cerco-. ruin* maritima. 9, seen from .... -. beneath: the left half of the sth poda; and similar rudimentary appendages plate removed: I-IX , •• -i j i • j i p ai segments ;c,cercopoda have been detected in the embryos ot Ci, coxnl iflands ; fix. eoxal stvlets /~i i T • i j TT ir, ovipositor.—After Coleoptera, Lepidoptera, and Hymenoptera from (Apidae). Cholodkowsky has observedeleven pairs of abdominal appendages in Phyllodromia. They are very long and multiarticulate in the Thysanura (). In the Dermaptera they are not jointed and are should also be observed that in the larva or Sisyra (Fig. 181)there are seven pairs of 5-jointed abdominal appendages, thoughthese may be secondary structures or tracheal gills. In the Per- THE CERCOPODA 165 lidse and th
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
