. Entomology : with special reference to its biological and economic aspects. Larva {A) and pupa (B) ofmosquito, Ciilcx (it^icns. r, respi-ratory tube; t, tracheal gills. ADAPTATIONS OF AQUATIC INSECTS 189 terized by the presence of spiracles, but have also developedan adaptive, or closed (apiiciisfic), type, for ntilizing- air thatis mixed with water. Through minor modifications of structure and habit, manyholopneustic insects have become fitted for an aquatic life. Inthese instances the insects have some means of carrying downa supply of air from the surface of the water. Thus Noto-nccta bea
. Entomology : with special reference to its biological and economic aspects. Larva {A) and pupa (B) ofmosquito, Ciilcx (it^icns. r, respi-ratory tube; t, tracheal gills. ADAPTATIONS OF AQUATIC INSECTS 189 terized by the presence of spiracles, but have also developedan adaptive, or closed (apiiciisfic), type, for ntilizing- air thatis mixed with water. Through minor modifications of structure and habit, manyholopneustic insects have become fitted for an aquatic life. Inthese instances the insects have some means of carrying downa supply of air from the surface of the water. Thus Noto-nccta bears on its body a silvery film of air entangled in closelyset hairs, which exclude the water. Gyvinus descends with abubble of air at the end of the abdomen. Dyfiscus and Hy-dro pliilus have each a capacious air-space between the elytra andthe abdomen, into which space the spiracles open. Nepa andRanafra have each a long respiratory organ composed of twovalves, which lock together to form a tube that communicateswith the single pair of spiracles situated near the end of the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
