Twenty-two new species in the genus Hyphantrophaga Townsend (Diptera: Tachinidae) from Area de Conservación Guanacaste, with a key to the species of Mesoamerica.

The following 22 new species of Hyphantrophaga are described: Hyphantrophaga adrianguadamuzi Fleming & Wood sp. n., Hyphantrophaga albopilosa Fleming & Wood sp. n., Hyphantrophaga anacordobae Fleming & Wood sp. n., Hyphantrophaga calixtomoragai Fleming & Wood sp. n., Hyphantrophaga calva Fleming & Wood sp. n.., Hyphantrophaga ciriloumanai Fleming & Wood sp. n., Hyphantrophaga danausophaga Fleming & Wood sp. n., Hyphantrophaga diniamartinezae Fleming & Wood sp. n., Hyphantrophaga duniagarciae Fleming & Wood sp. n., Hyphantrophaga edwinapui Fleming & Wood sp. n., Hyphantrophaga eldaarayae Fleming & Wood sp. n., Hyphantrophaga eliethcantillanoe Fleming & Wood sp. n., Hyphantrophaga gilberthampiei Fleming & Wood sp. n., Hyphantrophaga guillermopereirai Fleming & Wood sp. n., Hyphantrophaga hazelcambroneroae Fleming & Wood sp. n., Hyphantrophaga luciariosae Fleming & Wood sp. n., Hyphantrophaga manuelriosi Fleming & Wood sp. n., Hyphantrophaga morphophaga Fleming & Wood sp. n., Hyphantrophaga nigricauda Fleming & Wood sp. n., Hyphantrophaga osvaldoespinozai Fleming & Wood sp. n., Hyphantrophaga pabloumanai Fleming & Wood sp. n. and Hyphantrophaga similis Fleming & Wood sp. n.The following are proposed by Wood as new synonyms of Hyphantrophaga Townsend, 1892: Brachymasicera Townsend, 1911 syn. n., Ommasicera Townsend, 1911 syn. n., Ophirosturmia Townsend, 1911 syn. n., Patillalia Curran, 1934 syn. n. and Ypophaemyiops Townsend, 1935 syn. n.The following nine new combinations are proposed as a result of the new synonymies: Hyphantrophaga adamsoni (Thompson, 1963), comb. n., Hyphantrophaga fasciata (Curran, 1934), comb. n., Hyphantrophaga glauca (Giglio-Tos, 1893), comb. n., Hyphantrophaga gowdeyi (Curran, 1926), comb. n., Hyphantrophaga myersi (Aldrich, 1933), comb. n., Hyphantrophaga nigripes (Townsend, 1928), comb. n., Hyphantrophaga optica (Schiner, 1868), comb. n., Hyphantrophaga polita (Townsend, 1911), comb. n., Hyphantrophaga subpolita (Townsend, 1912), comb. n.