. Elementary lessons on insects. Insects. ODONATA 53 The abdomen is wide includes a large gill for capturing prey, and that is altogether unique and peculiar to this order. All are aquatic and breathe by means of gills. The nymphs of dragonflies are stout-bodied, rather un- attractive, stiff-legged creatures, that usually lie among the water weeds or in the bottom silt, and chamber in which the ali- mentary canal terminates. There are no external gills. These nymphs can swim rather jerkily by successive expulsions of water to rear- ward out of the gill chamber. The nymphs of damselflies are sl
. Elementary lessons on insects. Insects. ODONATA 53 The abdomen is wide includes a large gill for capturing prey, and that is altogether unique and peculiar to this order. All are aquatic and breathe by means of gills. The nymphs of dragonflies are stout-bodied, rather un- attractive, stiff-legged creatures, that usually lie among the water weeds or in the bottom silt, and chamber in which the ali- mentary canal terminates. There are no external gills. These nymphs can swim rather jerkily by successive expulsions of water to rear- ward out of the gill chamber. The nymphs of damselflies are slender, long-bodied, lank-legged creatures that cling to water weeds. The abdomen is narrow and bears on its tip three flat gill plates placed side by side with edges vertical. They swim by sculling with these gill plates, swinging the tip of the ab domen slowly from side to Fig. 19.—Three selected instars in the nymphal life of the "Big Green Darner" dragonfly, Anax Junius', A, new hatched; B, one-fourth grown; C, half grown. Such color changes are uncommon in this 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 Needham, James G. (James George), 1868-1956. Springfield, Ill. , Baltimore, Maryland, C. C. Thomas
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