Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . resabout it, by its enormous labium orunder lip. This forms a broad smoothmask covering the lower part of theface; it is armed at the broad spoon-shaped extremity with two sharp mov-able hooks, adapted for seizing and retaining its prey. It breathes by ad- FlG ^Sciina larvamitting water through the vent into (nymph). Natural size,the intestine, which near the end is lined with folds ofmembrane rich in tracheae, by which the air is extracted from the water and mixes with theblood; the folds are als
Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . resabout it, by its enormous labium orunder lip. This forms a broad smoothmask covering the lower part of theface; it is armed at the broad spoon-shaped extremity with two sharp mov-able hooks, adapted for seizing and retaining its prey. It breathes by ad- FlG ^Sciina larvamitting water through the vent into (nymph). Natural size,the intestine, which near the end is lined with folds ofmembrane rich in tracheae, by which the air is extracted from the water and mixes with theblood; the folds are also so arrangedthat the water thus introduced can beforced out as if from a syringe, bywhich the insect is suddenly propelledover the bottom. The entrance to theintestine is protected by from threeFIG. Nat. size, to five conical horny valves, whichopen and shut at will. The larva of Agrion and its allieshave three external broad, leaf-like, tracheary gills situatedat the end (in the larva of Euphaea the gills are attached tothe sides) of the body. Male dragon-flies are sometimes.
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
