- Eucera actuosa, Melissodes actuosa Cresson, 1878;Diadasia 3-cincta Provancher, 1896;Diadasia tricincta Fowler, 1899, emend;Synhalonia californica_homonym Fowler, 1899;Synhalonia fowleri Cockerell, 1905;Synhalonia actuosa (Cresson, 1878)
- Eucera californica, Melissodes californica Cresson, 1878;Synhalonia californica (Cresson, 1878);Synhalonia californica deserticola Timberlake, 1969;Eucera (Synhalonia) californica deserticola (Timberlake, 1969), valid subspecies
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