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Hatch Chart for Gallatin River, MT Insect Size Body/Wing Color Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Midge 16-22 Black, olive and cream bodied Pale Morning Dun 14-20 Pale yellow, grizzled Grasshoppers 2-8 Tan, yellow, olive bodied Golden Stone Fly 4-8 Mottled dark brown to tan Green Drake 10-16 Bright green and olive brown markings, color changes Little Western Green Drake 10-16 Olive brown Baetis 16-20 Blue winged olive Caddis 14-18 Olive, brown, yellow, black Salmonfly 4-8 Black/orange with gray wings Mahogony Dun 14-16 Red/brown with dark hackle