Male genitalia of B. transversale subgroup A B. transversale (voucher DNA4219, USA: Oregon: Harney County, Banks of Silver Creek, 1379 m, 43.7278°N, 119.6256°W) B B. transversale (voucher DNA2161, Canada: Alberta: Lethbridge, Oldman River, 800 m, 49.7043°N, 112.866°W) C B. erosum (voucher DNA4033, USA: Oregon: Curry Co., Floras Creek at route 124 SE Langlois, 21 m, 42.9132°N, 124.4251°W) D B. erosum (voucher DNA3562, USA: California: Del Norte Co., Wilson Creek, 3 m, 41.6051°N, 124.1005°W) E B. corgenoma (voucher DNA2180, USA: California: Sonoma Co., Russian River, 3 mi NE Healdsburg) F B. corgenoma (holotype, voucher DNA5673, USA: Oregon: Benton Co., Corvallis, Willamette River, 60 m, 44.5491°N, 123.2449°W). Scale bar: 0.1 mm.