Reference genome assemblies for the North American bumble bees Bombus flavifrons and Bombus fervidus, two phenotypically polymorphic species from distinct phylogenetic lineages. - Lozier JD; Schweizer RM; Sim SB; Hines HM; Branstetter MG; Benavides LR; Geib SM; Koch JBU (G3 (Bethesda, Md.), 2026)