. Fresh-water biology. Freshwater biology. 890 FRESH-WATER BIOLOGY sallies from one resting place to another, and alighting oftener on stones or other flat surfaces than on vertical stems. The damselflies are not such good flyers. The common black- wing Calopteryx (Fig. 13O1) may usually be seen fluttering gaily about the borders of creeks, but most damselflies are little in. Fig. 1360. The Blue Pirate dragonfly, Pachydiplax htwprtmis. (Drawn by Mrs. J. G. Ncedham.) evidence, and confine their locomotion to flitting from stem to stem amid the shelter of vegetation. The dragonflies eat other in
. Fresh-water biology. Freshwater biology. 890 FRESH-WATER BIOLOGY sallies from one resting place to another, and alighting oftener on stones or other flat surfaces than on vertical stems. The damselflies are not such good flyers. The common black- wing Calopteryx (Fig. 13O1) may usually be seen fluttering gaily about the borders of creeks, but most damselflies are little in. Fig. 1360. The Blue Pirate dragonfly, Pachydiplax htwprtmis. (Drawn by Mrs. J. G. Ncedham.) evidence, and confine their locomotion to flitting from stem to stem amid the shelter of vegetation. The dragonflies eat other insects in vast numbers and in great variety. A large part of their food consists of small diptera: and because many of these small diptera are noxious species, mos- quitos, etc., an extended inquiry was once made as to the feasibihty of using dragonflies to remove these pests: it appeared that dragon- flies are not at all discriminating in their feeding, and will as readily eat useful as noxious species. Then, too, they eat other dragonflies, apparently preferring forms that are only a little smaller than them- selves. Hagaiius, for example, eats Gomplius, and Gompliiis cats Mesothemis, and Mesothemis eats Lesles, and Lcstcs eats Argia, and Argia eats Ischnura, and so on from the greatest even unto the least of them. Many dragonflies are eaten by birds and other animals at then transformation, before they are able to fly and escape; and some of those that are not very strong-flying are eaten habitually by birds — the smaller Libellulines by king-birds, and the smaller damselflies by swallows. But it is doubtful whether anything that flies is able to capture in flight one of the swiftest 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, 18
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
