Table 1. Sample locality data. River/Stream Name Clearwater River Lee Creek Spray River Crooked Creek Kisaralik River *Big Springs *Cold Stream (Creek) Thomas Creek Beaver Creek Conejos River Hinman Creek La Plata River Middle Fk S.Platte R. Saugache Creek Rock Creek Blodgett Creek Rock Creek Chama River Pecos River Red River N. Fk Humboldt River Canyon Creek Umatilla River Walla Walla River Coal Creek Deer Creek Diamond Fork River Leeds Creek Mammoth Creek Mill Creek Monroe Creek Parowan Creek Salina Creek Code ~ ~ ~ ~ Kisa BigS Cold ~ Beav Cone Hinm Plat Spla Saug Rock Blod Rckr Cham Peco RedR Humb Cany Umat Wall Coal Deer Diam Leed Mamm Mill Monr Paro Sali N= 1 1 1 5 8 1 5 1 10 10 10 6 10 1 10 10 10 10 1 10 4 10 9 10 8 9 10 1 10 13 4 10 10 St./Prov AB AB AB AK AK CA CA CA CO CO CO CO CO CO ID MT MT NM NM NM NV OR OR OR UT UT UT UT UT UT UT UT UT County Clearwater Cardston Banff Park Kenai Penn. Bethel Siskiyou Sierra Modoc Gunnison Conejos Routt La Plata Park Saguache Cassia Ravalli Granite Rio Arriba San Miguel Taos Elko Grant Umatilla Umatilla Iron Garfield Utah Washington Garfield San Juan Sevier Iron Sevier Country Canada Canada Canada USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA USA Lat 51.9899° ~ ~ 60.5642° ~ ~ 39.5239° ~ 38.4947° 37.0574° 40.7512° 37.2752° 39.2189° 38.1295° 42.3350° 46.2891° 46.7109° 36.9124° 35.6934° 36.6983° 41.5783° 44.2913° 45.6745° 45.9214° 37.6717° 38.0125° 40.0787° 37.2655° 37.6280° 38.4836° 38.6105° 37.8085° 38.8791° Lon -115.3913° ~ ~ -149.9545° ~ ~ -120.2884° ~ -107.0319° -106.1903° -106.8383° -108.0334° -105.9941° -106.4568° -114.2822° -114.1609° -113.6736° -106.5732° -105.6942° -105.4764° -115.9309° -118.9570° -118.7587° -118.3737° -113.0413° -111.9740° -111.3708° -113.3688° -112.4567° -109.4086° -112.1058° -112.8094° -111.5531° BYU code 563 577 565 549-553 468-475 419 207-211 564 187-196 241-250 448-457 261-266 508-517 268 074-83 428-437 518-527 251-260 267 231-240 217-220 197-206 538-547 less 42 528-537 041-50 less 44,48 001-10 less 6 498-507 88 021-30 051-63 084-87 031-40 064-73 Soldier Creek Asotin Creek Green River Hoback River Wind River Sold Asot Gree Hoba Wind 10 2 9 5 1 UT WA WY WY WY Utah Asotin Sublette Sublette Fremont USA USA USA USA USA 39.9647° 46.3317° 43.0181° 43.2455° 43.5254° -111.3098° -117.0828° -110.1182° -110.4766° -109.6170° 011-20 465,467 438-447 less 445 487-491 558 *Indicates sample localities of outgroup taxa. "Code" is the stream name abbreviation appended to the specimen names in Figure 4. "Code" is the locality code which is appended to the seqeunce name in Figures 4 and 7. "BYU code" indicates the last three digits of the BYU voucher number is the specimen number used in Figures 4 and 7 (the first three digits are "i000" for all samples).