Half hours with insects . Nemoura and pupa. filaments. Notwithstanding the submerged life of thesecase worms, they are attacked by ichneumon flies when inthe larval state. How the young ichneumon lives in thesubmerged body of its host is not known. The branchial gills in the Perla and its allies, Nemoura(Fig. 112, and pupa) and Pteronarcys, etc., which are flat-bodied insects living under stones in streams, have been in-vestigated by Newport, the famous English anatomist, andquite recently by Dr. Gerstaecker of Berlin. Mr. Newportmade the astonishing discovery that the Avinged adult Ptero- 20
Half hours with insects . Nemoura and pupa. filaments. Notwithstanding the submerged life of thesecase worms, they are attacked by ichneumon flies when inthe larval state. How the young ichneumon lives in thesubmerged body of its host is not known. The branchial gills in the Perla and its allies, Nemoura(Fig. 112, and pupa) and Pteronarcys, etc., which are flat-bodied insects living under stones in streams, have been in-vestigated by Newport, the famous English anatomist, andquite recently by Dr. Gerstaecker of Berlin. Mr. Newportmade the astonishing discovery that the Avinged adult Ptero- 20 Packard] IXSECTS OF THE PO?^D AND STREAM. 149 Fig. 113. narcbjs retains its larval tracheal gills, and Dr. Gerstaeckerhas lately (liscovered that this is also the case with a speciesof Dianiphipnoa from Chili, and a European species of Ne-moura. This is analogous to certain Tritons or Salamanderswhich retain their gills in adult life. The larva of Ilydrophilus, the large water beetle (), breathes by means of spirac
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1881
