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<br /> - 24 - <br /> TABLE XIII <br /> BOTTOM FAUNA COLLECTIONS <br /> FROM SAN MIGUEL AND DOLORES RIVERS <br /> Station B-l B-2 B-3 B-4 B-5 B-6 B-7 1!.:Jl. <br />Organisms <br />Ephemeroptera <br />Baeti<lae 2 <br />Plecoptera <br />Perlodidae Isogeniae 3 73 11 6 <br />Pteronarcidae Pteronarcella 2 70 <br />Perlidae 1 80 1 <br />Trichoptera <br />Psychomyiidae 4 1 <br />Hydropsychidae 218 6 587 61 78 <br />Brachycentridae 54 63 4 15 <br />Diptera <br />Tendipedidae 11 l2 1 l8 8 1 68 28 <br />Simulidae 4 6 <br />Rhagionidae 3 1 5 <br />Tipulidae 1 2 <br />Ephydridae 3 1 <br />Deuterophlebiidae 1 <br />MeRaloptera <br />_Coryda lidae Corydalus cornutus 3 3 <br />Coleoptera <br />Elmidae 2 11 3 1 1 <br />Dytiscidae 3 <br />He.miptera <br />Naucoridae 6 5 <br />Veliidae (Rhagovelia obesa) 1 2 <br />Oaona te <br />Gomphidae ophiogomphus 1 2 <br />Coenagrionidae 1 <br />Anne lida <br />Lumbriculidae 1 <br />Number of species 3 6 2 10 9 9 8 .9 <br />Square yards sampled 1 1 2 1 2 1 1 1 <br />Number of organisms per square yard 19 36 2 307 15 880 150 137 <br />Weight of organisms (grams) 0.2 0.3 0.1 9.4 1.5 13.3 2.1 4.7 <br />Weight of organisms per square yard 0.2 0.3 <0.1 9.4 .7 13.3 2.1 4.7 <br />