Title: British dragonflies (Odonata)
Identifier: britishdragonfli00luca (find matches)
Year: 1900 (1900s)
Authors: Lucas, William John
Subjects: Dragon-flies; Odonata -- Great Britain
Publisher: London, L. U. Gill
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Text Appearing Before Image:
34 British Dragonflics. certainly used as organs of locomotion. Pressing their legs against the body, they sway the abdomen from side to side, and use the lamellae somewhat as a boatman does an oar at the stern of a boat in lieu of a rudder. In this way the Agrionine nymphs are able to progress at a very fair pace through the water. That the)^ do not breathe entirely by means of the lamella; is clear, for the)- often lose them, and live perfectly well without them, but the\^ are not able to move with so much ease through the water, even though they sway their body to a much greater extent.^ In the Calopterygiiuc, of the three appendages, the central one only is lamellar, but this sub-family seems to be possessed of an * Dewitz saw under the microscope "a stream of water pass in and out of the end of the intestine " in an Agrionine nymph, and con- sequently thinks that there may be a rectal means of respiration (Packard's Text-Book of Entomology, p. 464, 484), but breathing is no doubt carried on to some extent through the skin, especially in the younger nymjihs.
Text Appearing After Image:
Fig. 12.—Nymph of a Zygopterid Dragonfly (Erythromma naias). (Magnified). References same as for Fig. 11, except c.l. Caudal Lamelle.
Text Appearing After Fig. 11 that applies to Fig. 12:
m., Mask; v. Vertex; a., Antenna; e., Eye; o., Occiput; p., Prothorax; w.s., Wing-sheaths; f., Femur; t., Tibia; t.j., Tarsal Joints; u., Ungues (or claws); 4-10, Visible Segments of Abdomen.

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