. Fresh-water biology. Freshwater biology. 9o8 FRESH-WATER BIOLOGY climbing than swimming, and, consequently, they keep nearer to shore and to the shelter of submerged trash. In an aquarimn beetles of the size of Copiolomus and Laccophilus may be seen feed- ing in groups on the bodies of dragonfly nymphs and tadpoles much larger than themselves, which they have overpowered. Their own exceed- ingly hard chitinous armor doubtless protects them from being eaten by the majority of aquatic carnivorous animals. Egg-laying appears to have been observed hitherto only in Dytiscus, which deposits its eg
. Fresh-water biology. Freshwater biology. 9o8 FRESH-WATER BIOLOGY climbing than swimming, and, consequently, they keep nearer to shore and to the shelter of submerged trash. In an aquarimn beetles of the size of Copiolomus and Laccophilus may be seen feed- ing in groups on the bodies of dragonfly nymphs and tadpoles much larger than themselves, which they have overpowered. Their own exceed- ingly hard chitinous armor doubtless protects them from being eaten by the majority of aquatic carnivorous animals. Egg-laying appears to have been observed hitherto only in Dytiscus, which deposits its eggs singly in punctures made in the green stems of aquatic plants. The larvae are voracious creatures, armed with long sickle- shaped mandibles, like those of the larvae of the famihes just men- tioned, each mandible with so deep a groove on the inner side that it amounts to a perforation opening at the tip and the base. The. Fig. I37S. A predaceous diving beetle, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
