. Goldfish razze e altri pesci di acquario, la loro cura e la propagazione; una guida per acqua dolce e acquari marini, la loro fauna, flora e di gestione. Acquari; Goldfish. Insetti acquatici di acqua dolce. Sericostoma americana, Rhyacophila si torva, Leptocerus transversus e Mac- ronema zebratus, ciascuna anche rappresentativo di un genere distinto dell'ordine tricotteri. Ordine Thysanura. Questo ordine comprende il cosiddetto setola-tails, molla-tails, pesce-tarme e altri; wingless insetti che non subiscono metamorfosi e mantenere la forma larvale nell'adulto. Le parti di bocca sono sviluppati per mordere e

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. Goldfish breeds and other aquarium fishes, their care and propagation; a guide to freshwater and marine aquaria, their fauna, flora and management. Aquariums; Goldfish. AQUATIC INSECTS OF FRESHWATER. Sericostoma americana, Rhyacophila torva, Leptocerus transversus and Mac- ronema zebratus, each also representative of a distinct genus of the order Trichoptera. Order Thysanura. This order includes the so-called Bristle-tails, Spring-tails, Fish-moths and others; wingless insects which undergo no metamorphoses and retain the larval form in the adult. The mouth parts are developed for biting and chewing soft substances and they are some- times provided with rudimentary legs only. The sub-orders comprise the Bristle-tails or Cinura; the Spring-tails or Collembola, and the Water Spring-tails or Poduridse, with only the last of which we are concerned. Water Spring-Tails belong to the family of Poduridae, of which P. aquatica. Fig. 217, is often found on the surface of quiet ponds and still water. It is a black insect with six legs, dis- tinctly segmental abdomen without a constriction to divide it and the thorax, plumed antennas, reddish legs provided with hairs and sharp claws, devoid of wings, and of which the larvae may be distin- guished from the adult only by their still smaller size. Achorutes nivicola is another species some- times found under the surface of the water, and Lepidocyrtus americanus'vcv greenhouses, under logs fig. 117. Water-sprfngtaii, and in similar situations. They are small entirely ^odum. a, iuauca. Enlarged. harmless insects, mentioned only because they often attract the attention of the fish culturist and Natural History collector. Order Diptera. This order includes insects which may be properly called Flies; those having but two wings borne by the mesothorax and include the Mosquitoes, Midges and Gnats. The wings are thin and membranous, the mouth parts formed for sucking, the thorax and abdomen slender, and the eyes distinct and placed at th

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• bookcentury1900
• bookdecade1900
• booksubjectaquariu
• bookyear1908