Half hours with insects . arabidfe, the family comprising the ground beetles. Thelarvffi of these water beetles have the same kind of feelersand mouth-parts as the land Carabids ; the structure of theadult beetle is on the Carabid type, the body being, how-ever, more ovate and modified for swimming. Both types(Figs. 94 and 95) may have been derived from ancestorsof terrestrial habits. As proof of this we have the Cali-fornian Amphizoa (Fig. 96), which is said by Dr. Horn to 6 Packard] INSECTS OF THE POND AND STREAM. 135 be subaquatic, and in its structure and habits connects theCarabids with t
Half hours with insects . arabidfe, the family comprising the ground beetles. Thelarvffi of these water beetles have the same kind of feelersand mouth-parts as the land Carabids ; the structure of theadult beetle is on the Carabid type, the body being, how-ever, more ovate and modified for swimming. Both types(Figs. 94 and 95) may have been derived from ancestorsof terrestrial habits. As proof of this we have the Cali-fornian Amphizoa (Fig. 96), which is said by Dr. Horn to 6 Packard] INSECTS OF THE POND AND STREAM. 135 be subaquatic, and in its structure and habits connects theCarabids with tlie Dytiscidre. Out of the immense number of species of butterflies andmoths, but three or four genera are known to be larvjB of Hydrocampa, Cataclysta and Paraponyx, smallmoths of the family of PyralidiB, live in the water on theleaves of aquatic plants, the caterpillar of Paraponyx beingprovided both with branchite and spiracles. M. Bar haslately disco^ered in French Guiana a hairy caterpillar which Fig. A Tardigrade. lives in the water, and resembles that of our Arctia orwoolly bear. It has no tracheal branchiae, and all thespiracles except those on the segment behind the head and apair on the end of the body are smaller than usual. There uic no truly aquatic Hj-menoptera or aquatic Ileniiptcra, such as Gerris, Notonecta, a Corixaand a few other forms, all breathe atmospheric air, thoughthe stigmata may be elongated and otherwise modified forthe purpose. One spider, the Argyroneta of Europe, is 7 136 HALF HOUKS WITH INSECTS. [Packard. aquatic. We know of no other water spider. Certain mitesare aquatic, but do not differ from land species in tlieir modeof respiration. Tlie Tardigrades (Fig. 97, MacrohiotusAmericanus) are low microscopic mites, which live in waterand are called water bears. They have no spiracles nor airtubes, and respire solely through the skin. The Pycnogo-nids, which live at all depths of the ocean, from low waterto several h
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, tardigrade
