Sweltsa occidens

• Main Authors: Kondratieff, Boris C., Baumann, Richard W.
• Format: Text
• Language: unknown
• Published: Zenodo 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Plecoptera; Chloroperlidae; Sweltsa; Sweltsa occidens; Stripe; Pullen; Ross Lake; Crystal Creek; Paradise River; Andrews Creek; Skagway; Alaska
• Online Access: https://dx.doi.org/10.5281/zenodo.4762925; https://zenodo.org/record/4762925

Sweltsa occidens (Frison) (Figs. 10-17) Alloperla occidens Frison 1937: 96. Holotype ♂, Illinois Natural History Survey: Razorhone Creek, Shucksan (sic) [Shuksan](Whatcom Co.), Washington. Material examined. USA : Alaska: Pullen Creek, Skagway, 14 July 2002, K.T. Huntzinger, 1 ♂ (BYUC). Oregon: Clackamas Co., Mt. Hood, 3 mi below Timberline Lodge, 12 July 1979, B.P. Stark and K.W. Stewart, 1 ♀ (BPSC). Washington: Chelan Co. Minotaur Creek, 10 mi. W Wenatchee Lake, 14 July 1976, J.R. Wood, 7 ♂, 8 ♀ (BYUC); 21 July 1976, 2 ♂, 3 ♀ (BYUC); 4 August 1976, 3 ♂, 5 ♀ (BYUC); Lewis Co., Laughingwater Creek, 27 June 1995, E. Lisowski, 5 ♂ (CSUC); Falls Creek, Stevens Canyon Road, 25 June 2000, R. Lechleitner, 1 ♂ (CSUC); Panther Creek, 9 June 2001, R. Lechleitner, 1 ♂ (CSUC); Pierce Co., Paradise River, Fourth Crossing, Valley Road., 16 August 1999, B. Kondratieff, 1 ♂ (CSUC); 23 July 2000, R. Lechleitner, 2 ♂, 1 ♀ (CSUC); Meadow Creek, Mt. Rainier National Park, 14 July 1979, B.P. Stark and K.W. Stewart, 1 ♂ (BPSC); St. Andrews Creek, Westside Road, 24 July 1997, R. Lechleitner, 7 ♂, 25 ♀ (BYUC, CSUC); Skamania Co, small creek, N Twin Fall Creek, 30 July 1983, G.R. Fiala, 1 ♀ (BYUC); Snohomish Co., Crystal Creek, 1.6 mi. up FR 27 off FR 23, 11 mi. SE Darrington, 9 June 1994, G. Mackenzie, 1 ♂, 1 ♀ (BYUC); Whatcom Co., Big Face Creek, E Ross Lake, 1 mi. SE of Joker Mountain, 8 August 1966, K.E. Vander Mey, 3 ♂, 12 ♀ (BYUC); Swamp Creek, 7 August 1966, K.E. Vander Mey, 1 ♂, 1 ♀ (BYUC). Male. General color yellow in life, head with dark ocellar rings, pronotum yellow, but with dark lateral margins, black stripe running down terga 1-8, terminal mark on tergum 8 longer than wide and never divided. Tergum 9 lacking bare elevated process (Fig. 10). Epiproct erectile, elongate, in dorsal view, tapered to apex (Fig. 10); extreme apex bare, (Figs. 10-13), in lateral aspect, apex expanded ventrally, but generally flattened laterally (Figs. 12 & 13); dorsal and lateral surface of epiproct covered with dense pile of long appressed setae, extending to the epiproct base (Figs. 10-13), laterally, base bare (Fig. 12). Aedeagus tubular, constricted near upper ⅓, with two bulbous lobes, bearing two smaller apical projections (Figs. 14 & 15), more expanded apex with broad lobes and dorsal finger-like projection medially (Fig. 16), surface with comb-like setae arranged in interrupted rows, with patch of stronger setae located at base of constricted area (Figs. 16 & 17). Female. Color and markings similar to male. Subgenital plate subtriangular and not covering all of sternum 9, apex more narrowly rounded, often exhibiting a shallow emarginate area at the tip, but the posterior margin is usually entire (Fig. 27) for S. durfeei . : Published as part of Kondratieff, Boris C. & Baumann, Richard W., 2009, A Contribution To The Knowledge Of Sweltsa Exquisita (Frison) And S. Occidens (Frison) And Description Of A New Species Of Sweltsa From The Northern Rocky Mountains, U. S. A. (Plecoptera: Chloroperlidae), pp. 20-29 in Illiesia 5 (3) on pages 24-26, DOI: 10.5281/zenodo.4759034 : {"references": ["Frison, T. H. 1937. Descriptions of Plecoptera, with special reference to the Illinois species. Bulletin of the Illinois Natural History Survey, 21: 78 - 99"]}