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<br />PEARSON, KRAMER, FRANKLIN: MACROINVERTEB RATES 163 <br />River proper before closure of the dam were taken from <br />Edmunds and Musser (1960), Sessions and Gaufin (1960), Bosley <br />(1960), Woodbury et al. (1963), and Binns (1965). Records from <br />tributaries, ponds, seeps, and cutoff channels along the mainstem <br />Green River were not included in the list of invertebrates present <br />before September, 1962. In the few cases where it was not clear <br />whether collections were from the Green River proper, the species <br />in question were included. Data on macroinvertebrate fauna found <br />after September, 1962, were derived from the present study and <br />from Binns (1965), who studied the Green River above Flaming <br />Gorge Dam. <br />Nine invertebrate forms reported from the area prior to <br />September, 1962, were not collected during the present study nor <br />by Binns (Table 3). Three were mayflies (Pentagenia,2 Pseudiron, <br />and Genus et species novum), which were apparently rare before <br />impoundment (Edmunds and Musser, 1960; Binns, 1965). A fourth <br />mayfly, Baetis iasigni ficans, may have been among the 11 unidenti- <br />fied forms of Baetis nymphs collected during the present study <br />since complete taxonomic keys to Ephemeroptera nymphs in the <br />Green River are lacking. The genus Baetis is a particularly poorly- <br />known group. Claassenia sabulosa (Plecoptera) was formerly common <br />but was not taken in the present study. Perlesta (also Plecoptera) <br />was not found, but it was apparently rare prior to impoundment <br />(Sessions and Gaufin, 1960). Nymphs of Argia were not collected <br />during the present study, possibly because most of the sampling <br />was done in moving water, and they were overlooked in back- <br />waters and cutoff pools. Adult Zygoptera were frequently observed <br />and collected at all stations, however. Beetles of the family Helo- <br />didae were not found in the present study but one specimen was <br />taken in the preimpoundment collection made by Bosley (1960) on <br />the upper Green River in Wyoming. This family had not been <br />reported below the Flaming Gorge Dam site. Beetles of the <br />family Gyrinidae were observed often but were not collected with <br />the devices used in this study. <br />On the other hand, 10 groups of invertebrate forms not <br />previously reported in the area were collected during the present <br />study (Table 3). Hyaldla, Arcynopteryx, and Paraleptophlebia pallipes <br />probably existed previously in cool tributaries and found suitable <br />living conditions in the Green River after the dam was closed. <br />2Reported by Binns (1965). The record of this genus in Wyoming needs <br />to be confirmed (G. F. Edmunds, personal communication).