. Fresh-water biology. Freshwater biology. AQUATIC INSECTS 929 20 (19) 21 (18) 22 (i) 23 (47) Labium with five or six lateral setae, and with four mental setae each side; gills generally with no distinct pattern. Ischnura. Gillsjess than half as long as the abdomen, narrower and with a long tapering point; third segment of antenna more than a third longer than the second ... Anomalagrion. Without external respiratory plates, but with a respiratory chamber inside the wide abdomen; body less slender, and not widest across the head. (Dragonflies; proper.) Suborder Anisoptera . 23 Labium flat or n
. Fresh-water biology. Freshwater biology. AQUATIC INSECTS 929 20 (19) 21 (18) 22 (i) 23 (47) Labium with five or six lateral setae, and with four mental setae each side; gills generally with no distinct pattern. Ischnura. Gillsjess than half as long as the abdomen, narrower and with a long tapering point; third segment of antenna more than a third longer than the second ... Anomalagrion. Without external respiratory plates, but with a respiratory chamber inside the wide abdomen; body less slender, and not widest across the head. (Dragonflies; proper.) Suborder Anisoptera . 23 Labium flat or nearly so (the edges of the lateral lobes slightly up- turned in TacAo^tej-yx), without raptorial setae 24 24 (35, 46) Labium with its median lobe entire; antennae four-jointed, the fourth joint rudimentary; fore tarsi two-jointed: burrow- ing nymphs 25. 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
