The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Option 1 | Option 2 |
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Male genitalia as in sf 13.272, with basal segments of forceps having slight indentations along inner apical margins (inner margins of slide mounted material can appear to be almost straight because of chemical distortion produced by mounting media) | Male genitalia as in sf 13.273, with basal segments of forceps having broad distinct indentation on the inner margins (inner margins of slide mounted material can appear to have only a slight indentation because of chemical distortion produced by mounting media) |
Terminal segment of forceps inserted off center in the end of segment 2 (sf 13.272) | Terminal segments of forceps inserted in the center of the end of segment 2 (sf 13.273) |
Inner surface of segment 3 of forceps distinctly concave | Inner surface of segment 3 of forceps not concave |
Hind wing present, but small to minute and usually lacking longitudinal veins (rarely with 2 longitudinal veins in Heterocloeon frivolum) | Hind wings present or absent, but when present, usually with only 2 longitudinal veins |
4 Example Specimens | |
Heterocloeon | Acentrella |