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<br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />AQUATIC INSECTS OF THE ARKANSAS RIVER BASIN IN COLORADO <br /> <br />DATE <br /> <br />July 23, 1974 <br /> <br />COLLECTION SITE Chalk Creek, below Princetown, at bridge <br />ORDER FAMILY GENUS SPECIES <br />Ephemeroptera Heptageniidae Rhithrogena morri soni <br />Ephemeroptera Heptageniidae Epeorus (Ironopsis) grandis <br />Ephemeroptera Baetidae Baeti s <br />Oligochaete (class) <br />Pl ecoptera Chloroperlidae All operla <br /> <br />. <br /> <br />. <br /> <br />SAMPLE NO. 51 <br /> <br />NO. INDIVIDUALS <br /> <br />1 <br />12 <br />3 <br />1 <br />1 <br /> <br />. <br /> <br />..... <br />0) <br />(.,'1 <br />1"-' <br />