. British dragonflies (Odonata). Dragon-flies; Odonata -- Great Britain. The Iiiias^o. 51 Thoui^rh possessing considerable differences there is a great general resemblance between the wings of Dragonflies. The main nervures all have a sub-parallel direction, and these are joined by a large number of small transverse nervures, producing an intricate ^ y meshwork of cells. In one division, the Aiiis- optcridcs, forming the families Libcllulidic and ^-Esc/ii/ida\ the hind-wings are larger and different in shape from the fore-wings. In the other division, the Zygoptcrides, forming the family Agrio
. British dragonflies (Odonata). Dragon-flies; Odonata -- Great Britain. The Iiiias^o. 51 Thoui^rh possessing considerable differences there is a great general resemblance between the wings of Dragonflies. The main nervures all have a sub-parallel direction, and these are joined by a large number of small transverse nervures, producing an intricate ^ y meshwork of cells. In one division, the Aiiis- optcridcs, forming the families Libcllulidic and ^-Esc/ii/ida\ the hind-wings are larger and different in shape from the fore-wings. In the other division, the Zygoptcrides, forming the family Agrionidcc, the wings are similar and nearly equal. The shape, size, and colour of the pterostigma and accessory membrane, the conforma- tion of the triangle, the number of ante-cubital nervures, and the colour of the costa, are important points in classif)-ing the genera and species. On reference to Fig. 24, A, B, and C, it will be noticed that five longitudinal nervures terminate at the base of the wing ; these are, starting at the front margin, the costa, sub-costa, median, sub-median, and post-costa. The costa and median extend to the tip E 2. Yii\ -D(> VIEW OF lMAGf>. A: c, Eye; /., Frons; Vertex; Antenna; o., Occiput; />., Prothoiax ; /., Thorax; ;;is.;;., Meso-notum ; , Meta- notum ; an., Auricle; i-io, Segments ol Abdomen ; Upper Anal Append- ages; , Lower Anal Appendage. B: 8-11. Distal Segments of Abdomen of Female ; 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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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondo, bookyear1900
