. British dragonflies (Odonata). Dragon-flies; Odonata -- Great Britain. TJic Nymph. l^ First, with regard to the breathing apparatus, which is of more than ordinary interest, seeing that the earher part of the insect's existence is aquatic, in which state it breathes the air chssolved in the water, while the second part is aerial. Our knowledge of the respiration of the Dragonfly n\-mphs is far from complete, but certain facts ha\'e been well ascer- tained. One of these is that the Libcllulidci: breathe by means of rectal branchiae. The water is drawn in through an opening between the five an
. British dragonflies (Odonata). Dragon-flies; Odonata -- Great Britain. TJic Nymph. l^ First, with regard to the breathing apparatus, which is of more than ordinary interest, seeing that the earher part of the insect's existence is aquatic, in which state it breathes the air chssolved in the water, while the second part is aerial. Our knowledge of the respiration of the Dragonfly n\-mphs is far from complete, but certain facts ha\'e been well ascer- tained. One of these is that the Libcllulidci: breathe by means of rectal branchiae. The water is drawn in through an opening between the five anal appendages (Fig. I I, lat. , , ), which are then brought to- gether so as to close the orifice. After the air has been extracted, the water is ejected, and this can be done with such force as to propel the insect through the water at a \er\' considerable pace, and it is b}' repeating this process that the n\'mph moves about rapidl}-, though in a series of jerks. In place of the five-pointed appendages the Agriouiiuc have three thin blade-like lamellae (Fig. 12, ), which probably assist in respiration as the}' possess a ramification of trachea:;, but are D. Fig. II.—Nymph of an Axis- DPTERiD Dragonfly (AXAX IMPERATOR). );;., Mask ; f., Vertex ; Antenna ; c, Eye; o.,Occiput; /. )., Position of Leg-base Processes; p., Prothorax ; , Meso-thoracic Spiracle; k'.s., Wing-slieaths; /., Femur; t., Tibia; t.}.. Tarsal Joints; k., Ungues (or claws); 4-10, Visible Segments ot Abdomen ; , Male Projection; Upper Anal Appendage; lat. , Lateral Anal Appendages; Lower Anal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lucas, William John. London, L. U. Gill
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License: Licensed
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondo, bookyear1900
