- Eucera aragalli, Synhalonia frater aragalli Cockerell, 1904
- Eucera frater, Melissodes frater Cresson, 1878;Melissodes lata Provancher, 1888;Melissodes nigricornis Provancher, 1888;Synhalonia edwardsii race latior Cockerell, 1897;Synhalonia albopilosa Fowler, 1899;Tetralonia lata race lautipes Cockerell, 1924;Synhalonia frater lata (Provancher, 1888);Synhalonia frater albopilosa Fowler, 1899;Eucera (Synhalonia) frater lata (Provancher, 1888), valid subspecies;Eucera (Synhalonia) frater albopilosa (Fowler, 1899), valid subspecies
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