Slenderhead Sallfly

(Figs. 20-25)

Kathroperla takhoma Stark & Surdick 1987:527.

Holotype ♀ (United States National Museum), Falls Creek above Ohanapecosh River, Mt. Rainier National Park, Hwy 706, Washington

Material examined. USA: CALIFORNIA: Del Norte Co., 3 mi NE Hiouchi, 1 June 1991, B. Stark, R.W. Baumann, C. Henderson, 1♀, 1 larva (BPSC). Humboldt Co., Cedar Creek, Hwy 299, 25 April 1987, B. Stark, R.W. Baumann, C. R. Nelson, 2♂, 5♀ (BPSC). Humboldt Co., 1 mi E Cedar Creek, Hwy 299, 25 April 1987, B. Stark, R.W. Baumann, C. R. Nelson, 1♂ (BPSC). Humboldt Co., East Fork Willow Creek, East Fork Willow Creek Campground, 24 April 1987, B. Stark, R.W. Baumann, C. R. Nelson, 1♂, 4♀ (BPSC). Humboldt Co., Slide Creek, Hwy 13 south of Fish Lake Campground, 31 May 1991, B. Stark, R.W. Baumann, C. Henderson, 1♀ (BPSC), 2♀ (BYUC). Mendocino Co., Irish Gulch, 39° 01.209’N, 123° 41.268’W, 22 April 2005, L.D. Bottorff, 1♀ (RLBC). Mendocino Co., Same location, 2 April 2005, L.D. Bottorff, 1♂ (RLBC). Trinity Co., Clear Creek and tributaries, Hwy 36, 2.6 mi E of Forest Glen Campground, 40.3743°N, 123.3634°W, 9 May 2009, J.B. Sandberg, 2♂, 2♀, 1 larva, 2 exuvium (JBSC). OREGON: Benton Co., Yew Creek, Mary’s Peak Rd, 1 June 2000, B. Stark, I. Sivec, M. Zúñiga, 1♀ (BPSC). Benton Co., Lewisburg Saddle, Malaise trap, 44.6423°N, 121.4204°W, 31 May-12 June 2013, S. Fitzgerald, 5♂, 8♀ (CSUC). Same location, Malaise trap, 6-31 May 2013, S. Fitzgerald, 2♀ (CSUC). Lane Co., Watershed #10, Anderson Experimental Forest, 20 April 1972, R.W. Wisseman, 1♂, 1♀ (BYUC). Linn Co., tributary North Santiam River, Hwy 22, 0.2 mi below Minto Rd, 3 June 2000, B. Stark, I. Sivec, M. Zúñiga, 1♀ (BPSC). Multnomah Co., Bridal Veil Creek below Bridal Veil Falls, 13 May 2003, B.C. Kondratieff, R.W. Baumann, 1♀ (CSUC). Multnomah Co., Columbia River junction with Tanner Creek, 28 March 1987, G. R. Fiala, 1♂ (BYUC). WASHINGTON: Clallam Co., Madison Creek, Madison Creek Falls, Elwah River Valley, Olympic National Park, 48° 02’N, 123° 35’W, 15 June 2005, R.W. Baumann, B.C. Kondratieff, 1♀ (BYUC). Jefferson Co., Mineral Creek, tributary Hoh River, N 102-103, E 33-34, 24 June 1999, D.E. Bowles, 1♀ (BYUC). Lewis Co., Faith Creek, Hwy 706, Mt. Rainier National Park, 17 June 2004, B.C. Kondratieff, J. Schmidt, 2♀ (CSUC). Lewis Co., St. John Creek, Rt. 22, 13 mi E Rt. 23, 1 July 1985, C.M. Flint, O.S. Flint, Jr., 2♂ (USNM). Lewis Co., tributary Ohanapecosh River, Mt. Rainier National Park, 7 July 1999, B.C. Kondratieff, 1♀ (CSUC). Mason Co., Brown Creek, FR 2233, 12 mi NW Shelton, 22 April 1995, T.Nash, 1♂ (BYUC). Skamania Co., Rock Creek, Millard, tributary Little Salmon River, 15 May 2003, B.C. Kondratieff, R.W. Baumann, 1♂ (CSUC). Skamania Co., tributary Little White Salmon River, near Oklahoma Campground, 27 May 1984, G. R. Fiala, 1♀ (BYUC). Whatcom Co., Breckenridge Creek, 5 mi E Eversen, 11 May 1967, unknown collector, 1♀ (BYUC). Whatcom Co., Canyon Creek, Deming, 21 April 1967, unknown collector, 1♂ (BYUC). Whatcom Co., Sygitowicz Creek, 2 mi SW Van Zandt, 5 May 1994, Kraft and Sammeth, 1♂ (BYUC).

Egg. Outline oval, collar absent (Figs. 20-21, 23). Length ca. 431 μm, equatorial width ca. 253 μm. Collar end of egg bearing a dense cluster of small tubercles (Fig. 23). Chorionic surface sparsely covered throughout with small, projecting tubercles of irregular height (Figs. 23-25); some tubercles are grouped in poorly organized, short rows but most appear randomly placed. Micropyles subequatorial in position and frequently located in association with tubercles (Fig. 25).

Distribution. This species has previously been reported from California and Washington (Bottorff & Bottorff 2007; Kondratieff & Lechleitner 2002; Nelson & Stark 1987; Stark & Surdick 1987). The Oregon records listed above, though not unexpected, are the first reports from that state.