. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. 274 CLASSIFICATION [CH. Family 1. Calopterygidae. Wings seldom distinctly petiolate. Nodus not generally close to base of wing. Antenodals generally numerous, alwaj's considerably more than two. Venation close and rich, with numerous secondary sectors. Ms arises from iV/j_2 far proximad to nodus. M2 arises from M^ at subnodus, or a little distad from it. Quadrilateral regular or fairly so, never with a sharply-acute distal angle. Wings iridescent, generally beautifully coloured, often metalUc. Body-pattern usually dull imi
. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. 274 CLASSIFICATION [CH. Family 1. Calopterygidae. Wings seldom distinctly petiolate. Nodus not generally close to base of wing. Antenodals generally numerous, alwaj's considerably more than two. Venation close and rich, with numerous secondary sectors. Ms arises from iV/j_2 far proximad to nodus. M2 arises from M^ at subnodus, or a little distad from it. Quadrilateral regular or fairly so, never with a sharply-acute distal angle. Wings iridescent, generally beautifully coloured, often metalUc. Body-pattern usually dull imicolorous, or metallic, sometimes bicolorous. Larva verj^ variable; gizzard nearly always with sixteen fields, carrying numerous undifferentiated teeth. Mask of variable form, but without setae. Subfamily 1. Epallaginae. Sectors of arculus arising close to, or a Uttle above, the middle of the arculus. Quadrilateral regular or nearly so. Pterostigma long, regular. Larva rather broad and thick-set, with rather short abdomen. Mask flat, with median lobe entire or only slightly cleft. Antennae with short pedicel. Caudal gills saccoid. Lateral abdominal gills sometimes present. Tribe 1. Epallagini (fig. 137). Wings not petiolate. Numerous antenodals, those of first and second series nearly all corresponding. Nodus placed between one-third and middle of the wing-length. Ai-culus close to base, far removed from nodus. Lar\'a with 6-7 paii-s of lateral abdominal gUls; caudal gills in the form of ovoid sacs, ending in a point (fig. 87).. Fig. 137. Forewing (24 mm.) of Pseudophaea tricolor Selys, ^, Borneo. Original. Tribe 2. Libellagini (figs. 138, 153, also PI. I, figs. 4, 5). Wings petiolate. Numerous antenodals, but those of first an 1 second series not corresponding beyond arculus. Nodus placed between one-third and middle of wing-length, usually close to the former position. Arculus. Please note that these images are extracted from scanned page images that may have been digitally en
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